guloader | bb2c0f8952c81ef515102521083091df311b71929dc075a506a93cc5d8855527

Analysis

max time kernel
146s
max time network
149s
platform
windows10-2004_x64
resource
win10v2004-20240226-en
resource tags

arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
submitted
28-06-2024 01:43

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General

Target

bb2c0f8952c81ef515102521083091df311b71929dc075a506a93cc5d8855527.exe
Size

399KB
MD5

86ab45f914a047213012a783615a54fa
SHA1

42166d9321e30e79c33583e77a0d3de67e6142f2
SHA256

bb2c0f8952c81ef515102521083091df311b71929dc075a506a93cc5d8855527
SHA512

cbb6a1ccb8c4e28c8ea22c2ad881b7ef8c243c8e6f3abd5fc818d080a6b4417fb0ac5f412d488e46865fd5fe5db64e83b70c965e28fb65df9ac03696ee240a1f
SSDEEP

6144:bVGdx6xuO1TzGL7Bq0XtpZ+lsMA2Usp58ie1VvfpK70qkmXkbgn3/2tw7:ht1TzGLFtXtKxxEr1xg70ZEkbM3/2tw7

Score

10^/10

guloader downloader

Malware Config

Signatures

Guloader,Cloudeye
A shellcode based downloader first seen in 2020.
downloader guloader

Loads dropped DLL 4 IoCs

Processes:

bb2c0f8952c81ef515102521083091df311b71929dc075a506a93cc5d8855527.exe

pid	process
3652	bb2c0f8952c81ef515102521083091df311b71929dc075a506a93cc5d8855527.exe
3652	bb2c0f8952c81ef515102521083091df311b71929dc075a506a93cc5d8855527.exe
3652	bb2c0f8952c81ef515102521083091df311b71929dc075a506a93cc5d8855527.exe
3652	bb2c0f8952c81ef515102521083091df311b71929dc075a506a93cc5d8855527.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 1 IoCs

Processes:

bb2c0f8952c81ef515102521083091df311b71929dc075a506a93cc5d8855527.exe

pid process

3652 bb2c0f8952c81ef515102521083091df311b71929dc075a506a93cc5d8855527.exe

Suspicious use of SetThreadContext 1 IoCs

Processes:

bb2c0f8952c81ef515102521083091df311b71929dc075a506a93cc5d8855527.exe

description	pid	process	target process
PID 3652 set thread context of 3396	3652	bb2c0f8952c81ef515102521083091df311b71929dc075a506a93cc5d8855527.exe	bb2c0f8952c81ef515102521083091df311b71929dc075a506a93cc5d8855527.exe

Drops file in Windows directory 1 IoCs

Processes:

bb2c0f8952c81ef515102521083091df311b71929dc075a506a93cc5d8855527.exe

description ioc process

File opened for modification C:\Windows\Sjavs.ini bb2c0f8952c81ef515102521083091df311b71929dc075a506a93cc5d8855527.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082
Suspicious behavior: MapViewOfSection 1 IoCs

Processes:

bb2c0f8952c81ef515102521083091df311b71929dc075a506a93cc5d8855527.exe

pid process

3652 bb2c0f8952c81ef515102521083091df311b71929dc075a506a93cc5d8855527.exe

description	ioc	process
File opened for modification	C:\Windows\Sjavs.ini	bb2c0f8952c81ef515102521083091df311b71929dc075a506a93cc5d8855527.exe

Suspicious use of WriteProcessMemory 5 IoCs

Processes:

bb2c0f8952c81ef515102521083091df311b71929dc075a506a93cc5d8855527.exe

description	pid	process	target process
PID 3652 wrote to memory of 3396	3652	bb2c0f8952c81ef515102521083091df311b71929dc075a506a93cc5d8855527.exe	bb2c0f8952c81ef515102521083091df311b71929dc075a506a93cc5d8855527.exe
PID 3652 wrote to memory of 3396	3652	bb2c0f8952c81ef515102521083091df311b71929dc075a506a93cc5d8855527.exe	bb2c0f8952c81ef515102521083091df311b71929dc075a506a93cc5d8855527.exe
PID 3652 wrote to memory of 3396	3652	bb2c0f8952c81ef515102521083091df311b71929dc075a506a93cc5d8855527.exe	bb2c0f8952c81ef515102521083091df311b71929dc075a506a93cc5d8855527.exe
PID 3652 wrote to memory of 3396	3652	bb2c0f8952c81ef515102521083091df311b71929dc075a506a93cc5d8855527.exe	bb2c0f8952c81ef515102521083091df311b71929dc075a506a93cc5d8855527.exe
PID 3652 wrote to memory of 3396	3652	bb2c0f8952c81ef515102521083091df311b71929dc075a506a93cc5d8855527.exe	bb2c0f8952c81ef515102521083091df311b71929dc075a506a93cc5d8855527.exe

C:\Users\Admin\AppData\Local\Temp\bb2c0f8952c81ef515102521083091df311b71929dc075a506a93cc5d8855527.exe
"C:\Users\Admin\AppData\Local\Temp\bb2c0f8952c81ef515102521083091df311b71929dc075a506a93cc5d8855527.exe"
1⤵
- Loads dropped DLL
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious use of SetThreadContext
- Drops file in Windows directory
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:3652

C:\Users\Admin\AppData\Local\Temp\bb2c0f8952c81ef515102521083091df311b71929dc075a506a93cc5d8855527.exe
"C:\Users\Admin\AppData\Local\Temp\bb2c0f8952c81ef515102521083091df311b71929dc075a506a93cc5d8855527.exe"
2⤵
PID:3396

C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --no-appcompat-clear --mojo-platform-channel-handle=3968 --field-trial-handle=2356,i,13261194862334667799,7441241219475888176,262144 --variations-seed-version /prefetch:8
1⤵
PID:4504

Network

MITRE ATT&CK Matrix ATT&CK v13

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Resource Development

Reconnaissance

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\nsv61B4.tmp\BgImage.dll
Filesize
7KB

MD5
e9f3051a79f12aed819b91f028a463c1

SHA1
d088868584cdc04d391ec27cd318034a5ce562bc

SHA256
91b8073e8e67945e14fb10963fc9101fae8c298bd4cd7080b4e47b5bdd4af85c

SHA512
eac1fb48403959dc8a5ed20d8ced83c2276c510a781191c9f850bd3a9214c10c8ae0a4d9159dc3bb08f9686bc62f25dd31cccdcc48f568cc8678012333afe894

Download Submit
C:\Users\Admin\AppData\Local\Temp\nsv61B4.tmp\System.dll
Filesize
11KB

MD5
75ed96254fbf894e42058062b4b4f0d1

SHA1
996503f1383b49021eb3427bc28d13b5bbd11977

SHA256
a632d74332b3f08f834c732a103dafeb09a540823a2217ca7f49159755e8f1d7

SHA512
58174896db81d481947b8745dafe3a02c150f3938bb4543256e8cce1145154e016d481df9fe68dac6d48407c62cbe20753320ebd5fe5e84806d07ce78e0eb0c4

Download Submit
C:\Users\Admin\AppData\Local\Temp\nsv61B4.tmp\UserInfo.dll
Filesize
4KB

MD5
a6f622a2f12ac10bca04e23deff5cada

SHA1
abf851b5ccfb64004e9b49718a467bd754545887

SHA256
b8fa7b9393fff910144768588c471ca7c9ec98a2b8b186b2172b8ba7a5279500

SHA512
35c8b0db179104e638f1b40f3f8038a41fdc327e112de5cb0dbb97cbf1dfa276fcf6400fcb46b88cb5ba233ca769becbdb4b4d40920adca831e3c0f38193c50f

Download Submit
memory/3396-34-0x0000000001700000-0x00000000040E9000-memory.dmp

Filesize
41.9MB

Download
memory/3652-30-0x00000000042B0000-0x0000000006C99000-memory.dmp

Filesize
41.9MB

Download
memory/3652-31-0x00000000042B0000-0x0000000006C99000-memory.dmp

Filesize
41.9MB

Download
memory/3652-32-0x0000000077D71000-0x0000000077E91000-memory.dmp

Filesize
1.1MB

Download
memory/3652-33-0x0000000074A54000-0x0000000074A55000-memory.dmp

Filesize
4KB

Download