guloader | f8082dc1210616c55008edc73e1ca4966cd8575e2425ed72f71f28b97f71172a

Analysis

max time kernel
150s
max time network
154s
platform
windows7_x64
resource
win7-20230220-en
resource tags

arch:x64arch:x86image:win7-20230220-enlocale:en-usos:windows7-x64system
submitted
11/05/2023, 12:48

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General

Target
Understregninger.exe
Size 322KB
Sample230511-p1rdtadd28
SHA256 f8082dc1210616c55008edc73e1ca4966cd8575e2425ed72f71f28b97f71172a
MD5 4ab4a3d1894572436b1af077779f4051
SHA1 271cd8521dab65d5a9d127c5296acea983d29512
SHA512 4564299080a7d763da23b2ececa16927c86e8801167e9bcb82a3fa6a78e322447ae8991a677d8bb4cd519c972c0157f6a966f7b2301a985c22c14e2b6460d2a2
SSDEEP 6144:ex4veXIVOy5YUVFAEhpjyecwKz0CawKMeedSvR:o4GXfg1X1cw40sFPd4
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

guloader discovery downloader

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	Understregninger.exe
File opened (read-only)	C:\Program Files\Qemu-ga\qemu-ga.exe	caspol.exe

Loads dropped DLL 1 IoCs

pid	Process
1988	Understregninger.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

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
1988	Understregninger.exe
1728	caspol.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 1988 set thread context of 1728	1988	Understregninger.exe	27

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

System Information Discovery
T1082

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
1988	Understregninger.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 1988 wrote to memory of 1728	1988	Understregninger.exe	27
PID 1988 wrote to memory of 1728	1988	Understregninger.exe	27
PID 1988 wrote to memory of 1728	1988	Understregninger.exe	27
PID 1988 wrote to memory of 1728	1988	Understregninger.exe	27
PID 1988 wrote to memory of 1728	1988	Understregninger.exe	27

C:\Users\Admin\AppData\Local\Temp\Understregninger.exe
"C:\Users\Admin\AppData\Local\Temp\Understregninger.exe"
1⤵
- Checks QEMU agent file
- Loads dropped DLL
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious use of SetThreadContext
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:1988
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\caspol.exe
  "C:\Users\Admin\AppData\Local\Temp\Understregninger.exe"
  2⤵
  - Checks QEMU agent file
  - Suspicious use of NtSetInformationThreadHideFromDebugger
  PID:1728

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

94308059B57B3142E455B38A6EB92015

Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\94308059B57B3142E455B38A6EB92015
Size 62KB
SHA256 d015145d551ecd14916270efad773bbc9fd57fad2228d2c24559f696c961d904
MD5 3ac860860707baaf32469fa7cc7c0192
SHA1 c33c2acdaba0e6fa41fd2f00f186804722477639
SHA512 d62ad2408c969a95550fb87efda50f988770ba5e39972041bf85924275baf156b8bec309ecc6409e5acdd37ec175dea40eff921ab58933b5b5b5d35a6147567c
SSDEEP 1536:MRxM2u+06GOIVUvVmMKAfUfsrPa1jfCu18ZNMe3v:KMH+F3IacMZ2CPACu1GN7v
MD5 SHA1 SHA512 SSDEEP

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Tar1A7B.tmp

Path C:\Users\Admin\AppData\Local\Temp\Tar1A7B.tmp
Size 164KB
SHA256 c8733c93cc5aaf5ca206d06af22ee8dbdec764fb5085019a6a9181feb9dfdee6
MD5 4ff65ad929cd9a367680e0e5b1c08166
SHA1 c0af0d4396bd1f15c45f39d3b849ba444233b3a2
SHA512 f530dc0d024a5a3b8903ffaaa41b608a5ccdd6da4ba1949f2c2e55a9fca475fec5c8d2119b5763cabe7ef1c3788fb9dcac621869db51d65b1d83cfe404fb4c27
SSDEEP 1536:FUdJXlCUs0Rv0/29TFrJW5ibN/5YJkKCdru2hRIwjYvjCQ9vbmt6t0:FIJXq0Rn5JaJkHru2h2jCEvt2
MD5 SHA1 SHA512 SSDEEP

Submit Download

System.dll

Path \Users\Admin\AppData\Local\Temp\nsj3278.tmp\System.dll
Size 11KB
SHA256 a1390a78533c47e55cc364e97af431117126d04a7faed49390210ea3e89dd0e1
MD5 fbe295e5a1acfbd0a6271898f885fe6a
SHA1 d6d205922e61635472efb13c2bb92c9ac6cb96da
SHA512 2cb596971e504eaf1ce8e3f09719ebfb3f6234cea5ca7b0d33ec7500832ff4b97ec2bbe15a1fbf7e6a5b02c59db824092b9562cd8991f4d027feab6fd3177b06
SSDEEP 192:yPtkiQJr7V9r3Ftr87NfwXQ6whlgi62V7i77blbTc4DI:N7Vxr8IgLgi3sVc4
MD5 SHA1 SHA512 SSDEEP

Submit Download

memory/1728-86-0x0000000000C00000-0x0000000002DB8000-memory.dmp

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memory/1728-87-0x0000000000C00000-0x0000000002DB8000-memory.dmp

Download

memory/1728-88-0x0000000000400000-0x0000000000615000-memory.dmp

Download

memory/1988-84-0x00000000033A0000-0x0000000005558000-memory.dmp

Download

memory/1988-85-0x00000000033A0000-0x0000000005558000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

Replay Monitor

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Downloads