buer | 6160f3966660b788ea437d5d202547e54d7532582be55d0d93c37860e912111c

Analysis

max time kernel
119s
max time network
119s
platform
windows7_x64
resource
win7-20240419-en
resource tags

arch:x64arch:x86image:win7-20240419-enlocale:en-usos:windows7-x64system
submitted
26-04-2024 18:28

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General

Target

01644c1081aaa09a39deb82c7bcc48a7_JaffaCakes118.exe
Size

3.9MB
MD5

01644c1081aaa09a39deb82c7bcc48a7
SHA1

0522a3fed1b3d73029e6494e4e3b1019ee40a48d
SHA256

6160f3966660b788ea437d5d202547e54d7532582be55d0d93c37860e912111c
SHA512

b403ed4cd7b93fbfe4419eac7afa88d57307bbaef8a19edcca55bd3c9f99847186a014722706ba949dad3f4f35f3988dbe02e3e547b80b943275ebc59f58e5d0
SSDEEP

98304:iq2jZUD9cGCMIcGDJxgQgEZjAgDZIuIsYOY1sFiAJ8:i5jZUDxIXuJEpNlIuZY1giT

Score

10^/10

buer loader persistence

Malware Config

Extracted

Family

buer

http://burload01.top/

http://burload02.top/

Signatures

Buer
Buer is a new modular loader first seen in August 2019.
loader buer

Modifies WinLogon for persistence 2 TTPs 1 IoCs

persistence

Winlogon Helper DLL

T1547.004

Modify Registry

T1112

Processes:

errorResponder.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-481678230-3773327859-3495911762-1000\Software\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\ProgramData\\ErrorResponder\\errorResponder.exe\""	errorResponder.exe

Buer Loader 9 IoCs

Detects Buer loader in memory or disk.

loader

Processes:

resource	yara_rule
behavioral1/memory/2028-3-0x000000003F3E0000-0x000000004054F000-memory.dmp	buer
behavioral1/memory/2028-4-0x000000003F3E0000-0x000000004054F000-memory.dmp	buer
behavioral1/memory/2028-5-0x000000003F3E0000-0x000000004054F000-memory.dmp	buer
behavioral1/memory/2028-7-0x000000003F3E0000-0x000000004054F000-memory.dmp	buer
behavioral1/memory/2028-8-0x000000003F3E0000-0x000000004054F000-memory.dmp	buer
behavioral1/memory/2028-9-0x000000003F3E0000-0x000000004054F000-memory.dmp	buer
behavioral1/memory/2028-17-0x000000003F3E0000-0x000000004054F000-memory.dmp	buer
behavioral1/memory/2028-28-0x000000003F3E0000-0x000000004054F000-memory.dmp	buer
behavioral1/memory/2576-35-0x000000003F7B0000-0x000000004091F000-memory.dmp	buer

Deletes itself 1 IoCs

Processes:

errorResponder.exe

pid process

2576 errorResponder.exe
Executes dropped EXE 1 IoCs

Processes:

errorResponder.exe

pid process

2576 errorResponder.exe
Loads dropped DLL 1 IoCs

Processes:

01644c1081aaa09a39deb82c7bcc48a7_JaffaCakes118.exe

pid process

2028 01644c1081aaa09a39deb82c7bcc48a7_JaffaCakes118.exe

pid	process
2576	errorResponder.exe

pid	process
2576	errorResponder.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 8 IoCs

Processes:

01644c1081aaa09a39deb82c7bcc48a7_JaffaCakes118.exeerrorResponder.exe

pid	process
2028	01644c1081aaa09a39deb82c7bcc48a7_JaffaCakes118.exe
2028	01644c1081aaa09a39deb82c7bcc48a7_JaffaCakes118.exe
2028	01644c1081aaa09a39deb82c7bcc48a7_JaffaCakes118.exe
2028	01644c1081aaa09a39deb82c7bcc48a7_JaffaCakes118.exe
2028	01644c1081aaa09a39deb82c7bcc48a7_JaffaCakes118.exe
2028	01644c1081aaa09a39deb82c7bcc48a7_JaffaCakes118.exe
2028	01644c1081aaa09a39deb82c7bcc48a7_JaffaCakes118.exe
2576	errorResponder.exe

Program crash 1 IoCs

Processes:

WerFault.exe

pid pid_target process target process

1136 2576 WerFault.exe errorResponder.exe
Suspicious use of SetWindowsHookEx 2 IoCs

Processes:

01644c1081aaa09a39deb82c7bcc48a7_JaffaCakes118.exeerrorResponder.exe

pid process

2028 01644c1081aaa09a39deb82c7bcc48a7_JaffaCakes118.exe
2576 errorResponder.exe

pid	pid_target	process	target process
1136	2576	WerFault.exe	errorResponder.exe

Suspicious use of WriteProcessMemory 7 IoCs

Processes:

01644c1081aaa09a39deb82c7bcc48a7_JaffaCakes118.exe

description	pid	process	target process
PID 2028 wrote to memory of 2576	2028	01644c1081aaa09a39deb82c7bcc48a7_JaffaCakes118.exe	errorResponder.exe
PID 2028 wrote to memory of 2576	2028	01644c1081aaa09a39deb82c7bcc48a7_JaffaCakes118.exe	errorResponder.exe
PID 2028 wrote to memory of 2576	2028	01644c1081aaa09a39deb82c7bcc48a7_JaffaCakes118.exe	errorResponder.exe
PID 2028 wrote to memory of 2576	2028	01644c1081aaa09a39deb82c7bcc48a7_JaffaCakes118.exe	errorResponder.exe
PID 2028 wrote to memory of 2576	2028	01644c1081aaa09a39deb82c7bcc48a7_JaffaCakes118.exe	errorResponder.exe
PID 2028 wrote to memory of 2576	2028	01644c1081aaa09a39deb82c7bcc48a7_JaffaCakes118.exe	errorResponder.exe
PID 2028 wrote to memory of 2576	2028	01644c1081aaa09a39deb82c7bcc48a7_JaffaCakes118.exe	errorResponder.exe

C:\Users\Admin\AppData\Local\Temp\01644c1081aaa09a39deb82c7bcc48a7_JaffaCakes118.exe
"C:\Users\Admin\AppData\Local\Temp\01644c1081aaa09a39deb82c7bcc48a7_JaffaCakes118.exe"
1⤵
- Loads dropped DLL
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2028

C:\ProgramData\ErrorResponder\errorResponder.exe
C:\ProgramData\ErrorResponder\errorResponder.exe "C:\Users\Admin\AppData\Local\Temp\01644c1081aaa09a39deb82c7bcc48a7_JaffaCakes118.exe" ensgJJ
2⤵
- Modifies WinLogon for persistence
- Deletes itself
- Executes dropped EXE
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious use of SetWindowsHookEx
PID:2576

C:\Windows\SysWOW64\secinit.exe
C:\ProgramData\ErrorResponder\errorResponder.exe
3⤵
PID:1960

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 2576 -s 420
3⤵
- Program crash
PID:1136

MITRE ATT&CK Matrix ATT&CK v13

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Winlogon Helper DLL

T1547.004

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Winlogon Helper DLL

T1547.004

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Resource Development

Reconnaissance

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Downloads

\ProgramData\ErrorResponder\errorResponder.exe
Filesize
3.9MB

MD5
01644c1081aaa09a39deb82c7bcc48a7

SHA1
0522a3fed1b3d73029e6494e4e3b1019ee40a48d

SHA256
6160f3966660b788ea437d5d202547e54d7532582be55d0d93c37860e912111c

SHA512
b403ed4cd7b93fbfe4419eac7afa88d57307bbaef8a19edcca55bd3c9f99847186a014722706ba949dad3f4f35f3988dbe02e3e547b80b943275ebc59f58e5d0

Download Submit
memory/2028-5-0x000000003F3E0000-0x000000004054F000-memory.dmp

Filesize
17.4MB

Download
memory/2028-2-0x0000000077500000-0x0000000077501000-memory.dmp

Filesize
4KB

Download
memory/2028-3-0x000000003F3E0000-0x000000004054F000-memory.dmp

Filesize
17.4MB

Download
memory/2028-4-0x000000003F3E0000-0x000000004054F000-memory.dmp

Filesize
17.4MB

Download
memory/2028-6-0x000000007EBD0000-0x000000007EFA1000-memory.dmp

Filesize
3.8MB

Download
memory/2028-17-0x000000003F3E0000-0x000000004054F000-memory.dmp

Filesize
17.4MB

Download
memory/2028-7-0x000000003F3E0000-0x000000004054F000-memory.dmp

Filesize
17.4MB

Download
memory/2028-8-0x000000003F3E0000-0x000000004054F000-memory.dmp

Filesize
17.4MB

Download
memory/2028-9-0x000000003F3E0000-0x000000004054F000-memory.dmp

Filesize
17.4MB

Download
memory/2028-28-0x000000003F3E0000-0x000000004054F000-memory.dmp

Filesize
17.4MB

Download
memory/2028-1-0x000000007EBD0000-0x000000007EFA1000-memory.dmp

Filesize
3.8MB

Download
memory/2028-0-0x000000003F3E0000-0x000000004054F000-memory.dmp

Filesize
17.4MB

Download
memory/2028-29-0x0000000004250000-0x00000000053BF000-memory.dmp

Filesize
17.4MB

Download
memory/2576-11-0x0000000000090000-0x000000000011E000-memory.dmp

Filesize
568KB

Download
memory/2576-30-0x0000000077500000-0x0000000077501000-memory.dmp

Filesize
4KB

Download
memory/2576-20-0x0000000000090000-0x000000000011E000-memory.dmp

Filesize
568KB

Download
memory/2576-13-0x0000000000120000-0x0000000000121000-memory.dmp

Filesize
4KB

Download
memory/2576-26-0x0000000000090000-0x000000000011E000-memory.dmp

Filesize
568KB

Download
memory/2576-25-0x0000000000090000-0x000000000011E000-memory.dmp

Filesize
568KB

Download
memory/2576-24-0x0000000000090000-0x000000000011E000-memory.dmp

Filesize
568KB

Download
memory/2576-22-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/2576-32-0x000000003F7B0000-0x000000004091F000-memory.dmp

Filesize
17.4MB

Download
memory/2576-33-0x0000000000090000-0x000000000011E000-memory.dmp

Filesize
568KB

Download
memory/2576-35-0x000000003F7B0000-0x000000004091F000-memory.dmp

Filesize
17.4MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v13

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Downloads