guloader | 2e6a8bb2fcfef5cdc29aa03bfe22b01ebe7b3f71e09ad302dec93d672d1c3141

Analysis

max time kernel
97s
max time network
100s
platform
windows7_x64
resource
win7-20221111-en
resource tags

arch:x64arch:x86image:win7-20221111-enlocale:en-usos:windows7-x64system
submitted
01/02/2023, 16:03

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General

Target
a74960472ab338a421fb56948e742f2b.exe
Size 619KB
Sample230201-thd3zsce21
SHA256 2e6a8bb2fcfef5cdc29aa03bfe22b01ebe7b3f71e09ad302dec93d672d1c3141
MD5 a74960472ab338a421fb56948e742f2b
SHA1 c39bd553f3a1b8147f98056f8ea81bb6d6099b1e
SHA512 7cbbc8d2ba0202370a82bbd2f24a7123a364e41a89c6f1f5472f702c91cac9f976ea1189c32462f97e5bff8c46978c691df9260945eeefb5054b09b65289da9d
SSDEEP 12288:b7EWNDJccwIWYh7jQ4+ngZnz/B4WW3nVVP7ntr9+E78MNv1z2qcNjRtBnMAr8+:MUlyYtjQ4UWz/B4vT7CE78YvjsNfC+
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

guloader discovery downloader persistence

Malware Config

Signatures

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

Checks QEMU agent file 2 TTPs 2 IoCs

Checks presence of QEMU agent, possibly to detect virtualization.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
File opened (read-only)	C:\Program Files\Qemu-ga\qemu-ga.exe	a74960472ab338a421fb56948e742f2b.exe
File opened (read-only)	C:\Program Files\Qemu-ga\qemu-ga.exe	ieinstal.exe

Loads dropped DLL 1 IoCs

pid	Process
1748	a74960472ab338a421fb56948e742f2b.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-3406023954-474543476-3319432036-1000\Software\Microsoft\Windows\CurrentVersion\RunOnce	ieinstal.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3406023954-474543476-3319432036-1000\Software\Microsoft\Windows\CurrentVersion\RunOnce\Unnominated25 = "C:\\Users\\Admin\\AppData\\Roaming\\Cpa\\Alpargata.exe"	ieinstal.exe

Checks installed software on the system 1 TTPs
Looks up Uninstall key entries in the registry to enumerate software on the system.
discovery

Query Registry
T1012
Legitimate hosting services abused for malware hosting/C2 1 TTPs

Web Service
T1102

Suspicious use of NtCreateThreadExHideFromDebugger 2 IoCs

pid	Process
1536	ieinstal.exe
1536	ieinstal.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
1748	a74960472ab338a421fb56948e742f2b.exe
1536	ieinstal.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 1748 set thread context of 1536	1748	a74960472ab338a421fb56948e742f2b.exe	28

Drops file in Program Files directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Program Files (x86)\internet explorer\ieinstal.exe	ieinstal.exe

Drops file in Windows directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\resources\0409\Vre\Prstekrave\Uskadeliggjort.Pun	a74960472ab338a421fb56948e742f2b.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
1748	a74960472ab338a421fb56948e742f2b.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1536	ieinstal.exe

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 1748 wrote to memory of 1536	1748	a74960472ab338a421fb56948e742f2b.exe	28
PID 1748 wrote to memory of 1536	1748	a74960472ab338a421fb56948e742f2b.exe	28
PID 1748 wrote to memory of 1536	1748	a74960472ab338a421fb56948e742f2b.exe	28
PID 1748 wrote to memory of 1536	1748	a74960472ab338a421fb56948e742f2b.exe	28
PID 1748 wrote to memory of 1536	1748	a74960472ab338a421fb56948e742f2b.exe	28
PID 1748 wrote to memory of 1536	1748	a74960472ab338a421fb56948e742f2b.exe	28
PID 1748 wrote to memory of 1536	1748	a74960472ab338a421fb56948e742f2b.exe	28
PID 1748 wrote to memory of 1536	1748	a74960472ab338a421fb56948e742f2b.exe	28
PID 1536 wrote to memory of 2020	1536	ieinstal.exe	31
PID 1536 wrote to memory of 2020	1536	ieinstal.exe	31
PID 1536 wrote to memory of 2020	1536	ieinstal.exe	31
PID 1536 wrote to memory of 2020	1536	ieinstal.exe	31

C:\Users\Admin\AppData\Local\Temp\a74960472ab338a421fb56948e742f2b.exe
"C:\Users\Admin\AppData\Local\Temp\a74960472ab338a421fb56948e742f2b.exe"
1⤵
- Checks QEMU agent file
- Loads dropped DLL
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious use of SetThreadContext
- Drops file in Windows directory
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:1748
- C:\Program Files (x86)\internet explorer\ieinstal.exe
  "C:\Users\Admin\AppData\Local\Temp\a74960472ab338a421fb56948e742f2b.exe"
  2⤵
  - Checks QEMU agent file
  - Adds Run key to start application
  - Suspicious use of NtCreateThreadExHideFromDebugger
  - Suspicious use of NtSetInformationThreadHideFromDebugger
  - Drops file in Program Files directory
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:1536
- - C:\Windows\SysWOW64\WScript.exe
    "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\nbykgjwfgjzyovrumvpgvajx.vbs"
    3⤵
    PID:2020

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

T1060

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Web Service

T1102

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Web Service

T1102

Exfiltration

Impact

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Downloads

nbykgjwfgjzyovrumvpgvajx.vbs

Path C:\Users\Admin\AppData\Local\Temp\nbykgjwfgjzyovrumvpgvajx.vbs
Size 366B
SHA256 1a899121e3969c2bb894e08765a57e8a65cb9154d71c3825baa6b4f2da61d8f3
MD5 0fe2423601d3291b0b6326e6518286a0
SHA1 09746eb739147f191068aba1552cd616eabd5e1d
SHA512 9632acaa96bf0d7bc5f3754d15117079888fcc23591007fc7f4d5dabfdb1e9300cf96ff3ee9266fe2d29ea118623651773d1002d5a3f91270471841d5012cec6
MD5 SHA1 SHA512

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System.dll

Path \Users\Admin\AppData\Local\Temp\nsi956.tmp\System.dll
Size 11KB
SHA256 c2f405d7402f815d0c3fadd9a50f0bbbb1bab9aa38fe347823478a2587299448
MD5 9625d5b1754bc4ff29281d415d27a0fd
SHA1 80e85afc5cccd4c0a3775edbb90595a1a59f5ce0
SHA512 dce52b640897c2e8dbfd0a1472d5377fa91fb9cf1aeff62604d014bccbe5b56af1378f173132abeb0edd18c225b9f8f5e3d3e72434aed946661e036c779f165b
SSDEEP 192:eX24sihno00Wfl97nH6BenXwWobpWBTtvShJ5omi7dJWjOlqSlS:D8QIl972eXqlWBFSt273YOlqz
MD5 SHA1 SHA512 SSDEEP

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memory/1536-75-0x00000000770A0000-0x0000000077249000-memory.dmp

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memory/1536-78-0x0000000077280000-0x0000000077400000-memory.dmp

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memory/1536-83-0x0000000077280000-0x0000000077400000-memory.dmp

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memory/1536-82-0x0000000000EF0000-0x0000000001A31000-memory.dmp

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memory/1536-59-0x0000000000EF0000-0x0000000001A31000-memory.dmp

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memory/1536-77-0x0000000077280000-0x0000000077400000-memory.dmp

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memory/1536-69-0x00000000770A0000-0x0000000077249000-memory.dmp

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memory/1536-70-0x0000000077280000-0x0000000077400000-memory.dmp

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memory/1536-71-0x0000000077280000-0x0000000077400000-memory.dmp

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memory/1536-76-0x0000000077280000-0x0000000077400000-memory.dmp

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memory/1536-73-0x0000000000EF0000-0x0000000001A31000-memory.dmp

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memory/1748-74-0x0000000077280000-0x0000000077400000-memory.dmp

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memory/1748-54-0x0000000074FD1000-0x0000000074FD3000-memory.dmp

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memory/1748-72-0x0000000077280000-0x0000000077400000-memory.dmp

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memory/1748-64-0x0000000002860000-0x00000000034AA000-memory.dmp

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memory/1748-63-0x0000000077280000-0x0000000077400000-memory.dmp

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memory/1748-56-0x0000000002860000-0x00000000034AA000-memory.dmp

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memory/1748-62-0x0000000077280000-0x0000000077400000-memory.dmp

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memory/1748-61-0x00000000770A0000-0x0000000077249000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads