guloader | 4f7f31c878cf529376cda6d5ac508e1ef4bd0fab793edc84f4841383c84dbc79

Analysis

max time kernel
150s
max time network
152s
platform
windows10-2004_x64
resource
win10v2004-20220812-en
resource tags

arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
submitted
06-02-2023 10:36

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General

Target

1430fc7b02d27de2472ec82b085e6c12a1c9a236bf9f10607d39cff2cfcf3406.exe
Size

689KB
MD5

ceba3a31aeda8eea8efc26bb787ec690
SHA1

b3a8b39e8438984ba680fe597df728940ed09a66
SHA256

1430fc7b02d27de2472ec82b085e6c12a1c9a236bf9f10607d39cff2cfcf3406
SHA512

139ce4a7e0fc91450beb6ab7a29711081db0e033902b5c385bc6408e65dbbcbd35e0621bdd4c2010ff15e91a818311f314d4f15e8f5d636e9d9994f3922a7e5f
SSDEEP

12288:2cMkhWAEQ0J6rpEretKUjQ0kKSMtpSe2Tahcjd/1FhUxsBPGtVppPNF:czQ0J+EreVFkKSekehm/1FuxsetrhX

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

Processes:

caspol.exe1430fc7b02d27de2472ec82b085e6c12a1c9a236bf9f10607d39cff2cfcf3406.exe

description	ioc	process
File opened (read-only)	C:\Program Files\Qemu-ga\qemu-ga.exe	caspol.exe
File opened (read-only)	C:\Program Files\Qemu-ga\qemu-ga.exe	1430fc7b02d27de2472ec82b085e6c12a1c9a236bf9f10607d39cff2cfcf3406.exe

Loads dropped DLL 1 IoCs

Processes:

1430fc7b02d27de2472ec82b085e6c12a1c9a236bf9f10607d39cff2cfcf3406.exe

pid process

3836 1430fc7b02d27de2472ec82b085e6c12a1c9a236bf9f10607d39cff2cfcf3406.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

Processes:

1430fc7b02d27de2472ec82b085e6c12a1c9a236bf9f10607d39cff2cfcf3406.execaspol.exe

pid process

3836 1430fc7b02d27de2472ec82b085e6c12a1c9a236bf9f10607d39cff2cfcf3406.exe
4708 caspol.exe

pid	process
3836	1430fc7b02d27de2472ec82b085e6c12a1c9a236bf9f10607d39cff2cfcf3406.exe

pid	process
3836	1430fc7b02d27de2472ec82b085e6c12a1c9a236bf9f10607d39cff2cfcf3406.exe
4708	caspol.exe

Suspicious use of SetThreadContext 1 IoCs

Processes:

1430fc7b02d27de2472ec82b085e6c12a1c9a236bf9f10607d39cff2cfcf3406.exe

description	pid	process	target process
PID 3836 set thread context of 4708	3836	1430fc7b02d27de2472ec82b085e6c12a1c9a236bf9f10607d39cff2cfcf3406.exe	caspol.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

Processes:

1430fc7b02d27de2472ec82b085e6c12a1c9a236bf9f10607d39cff2cfcf3406.exe

pid process

3836 1430fc7b02d27de2472ec82b085e6c12a1c9a236bf9f10607d39cff2cfcf3406.exe

pid	process
3836	1430fc7b02d27de2472ec82b085e6c12a1c9a236bf9f10607d39cff2cfcf3406.exe

Suspicious use of WriteProcessMemory 4 IoCs

Processes:

1430fc7b02d27de2472ec82b085e6c12a1c9a236bf9f10607d39cff2cfcf3406.exe

description	pid	process	target process
PID 3836 wrote to memory of 4708	3836	1430fc7b02d27de2472ec82b085e6c12a1c9a236bf9f10607d39cff2cfcf3406.exe	caspol.exe
PID 3836 wrote to memory of 4708	3836	1430fc7b02d27de2472ec82b085e6c12a1c9a236bf9f10607d39cff2cfcf3406.exe	caspol.exe
PID 3836 wrote to memory of 4708	3836	1430fc7b02d27de2472ec82b085e6c12a1c9a236bf9f10607d39cff2cfcf3406.exe	caspol.exe
PID 3836 wrote to memory of 4708	3836	1430fc7b02d27de2472ec82b085e6c12a1c9a236bf9f10607d39cff2cfcf3406.exe	caspol.exe

C:\Users\Admin\AppData\Local\Temp\1430fc7b02d27de2472ec82b085e6c12a1c9a236bf9f10607d39cff2cfcf3406.exe
"C:\Users\Admin\AppData\Local\Temp\1430fc7b02d27de2472ec82b085e6c12a1c9a236bf9f10607d39cff2cfcf3406.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:3836

C:\Windows\Microsoft.NET\Framework\v4.0.30319\caspol.exe
"C:\Users\Admin\AppData\Local\Temp\1430fc7b02d27de2472ec82b085e6c12a1c9a236bf9f10607d39cff2cfcf3406.exe"
2⤵
- Checks QEMU agent file
- Suspicious use of NtSetInformationThreadHideFromDebugger
PID:4708

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\nsq7C89.tmp\System.dll
Filesize
12KB

MD5
8cf2ac271d7679b1d68eefc1ae0c5618

SHA1
7cc1caaa747ee16dc894a600a4256f64fa65a9b8

SHA256
6950991102462d84fdc0e3b0ae30c95af8c192f77ce3d78e8d54e6b22f7c09ba

SHA512
ce828fb9ecd7655cc4c974f78f209d3326ba71ced60171a45a437fc3fff3bd0d69a0997adaca29265c7b5419bdea2b17f8cc8ceae1b8ce6b22b7ed9120bb5ad3

Download Submit
memory/3836-133-0x0000000003280000-0x0000000004A06000-memory.dmp

Filesize
23.5MB

Download
memory/3836-134-0x0000000003280000-0x0000000004A06000-memory.dmp

Filesize
23.5MB

Download
memory/3836-135-0x00007FF93BAB0000-0x00007FF93BCA5000-memory.dmp

Filesize
2.0MB

Download
memory/3836-137-0x0000000077CF0000-0x0000000077E93000-memory.dmp

Filesize
1.6MB

Download
memory/4708-136-0x0000000000000000-mapping.dmp

Download
memory/4708-138-0x0000000001300000-0x0000000002A86000-memory.dmp

Filesize
23.5MB

Download
memory/4708-139-0x00007FF93BAB0000-0x00007FF93BCA5000-memory.dmp

Filesize
2.0MB

Download
memory/4708-140-0x0000000001300000-0x0000000002A86000-memory.dmp

Filesize
23.5MB

Download
memory/4708-141-0x0000000077CF0000-0x0000000077E93000-memory.dmp

Filesize
1.6MB

Download
memory/4708-142-0x00007FF93BAB0000-0x00007FF93BCA5000-memory.dmp

Filesize
2.0MB

Download
memory/4708-143-0x0000000077CF0000-0x0000000077E93000-memory.dmp

Filesize
1.6MB

Download