guloader | 65a3c64d3a3233b59e05fb065e7c50c6b8d6598f8403ff7fc0cf7656da0d1fa7

Analysis

max time kernel
147s
max time network
150s
platform
windows7_x64
resource
win7-20230220-en
resource tags

arch:x64arch:x86image:win7-20230220-enlocale:en-usos:windows7-x64system
submitted
11/06/2023, 01:56

Sharing

Copy URL Twitter E-mail

Report Analysis Logs

General

Target

44ccaf612dddde11842167c8d5b7c336272ceb8c332f1325abf3e690382f02c4.exe
Size

467KB
MD5

d319fee1a295e5b7d901a69de2fef70c
SHA1

ae2397688f56c3b8b56448a11027a3aae652084b
SHA256

44ccaf612dddde11842167c8d5b7c336272ceb8c332f1325abf3e690382f02c4
SHA512

84487fdb134bbb5664591cb481f5f789eae2efef29b4ae0385ba5d898ef893f09d203c017d4fd8be46e7560bc10c14539287af5f592698da0284f505f694edf8
SSDEEP

6144:imOPQGwvUsu5KcHlmI+PQM345zPU7Ldb2IXvckRgqqYg+ln:TRu5KjZPQ2KM7LkIfrRhq/+ln

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	caspol.exe
File opened (read-only)	C:\Program Files\Qemu-ga\qemu-ga.exe	44ccaf612dddde11842167c8d5b7c336272ceb8c332f1325abf3e690382f02c4.exe

Loads dropped DLL 1 IoCs

pid	Process
2044	44ccaf612dddde11842167c8d5b7c336272ceb8c332f1325abf3e690382f02c4.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 NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
2044	44ccaf612dddde11842167c8d5b7c336272ceb8c332f1325abf3e690382f02c4.exe
524	caspol.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 2044 set thread context of 524	2044	44ccaf612dddde11842167c8d5b7c336272ceb8c332f1325abf3e690382f02c4.exe	29

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

System Information Discovery
T1082

Suspicious behavior: MapViewOfSection 2 IoCs

pid	Process
2044	44ccaf612dddde11842167c8d5b7c336272ceb8c332f1325abf3e690382f02c4.exe
2044	44ccaf612dddde11842167c8d5b7c336272ceb8c332f1325abf3e690382f02c4.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 2044 wrote to memory of 436	2044	44ccaf612dddde11842167c8d5b7c336272ceb8c332f1325abf3e690382f02c4.exe	28
PID 2044 wrote to memory of 436	2044	44ccaf612dddde11842167c8d5b7c336272ceb8c332f1325abf3e690382f02c4.exe	28
PID 2044 wrote to memory of 436	2044	44ccaf612dddde11842167c8d5b7c336272ceb8c332f1325abf3e690382f02c4.exe	28
PID 2044 wrote to memory of 436	2044	44ccaf612dddde11842167c8d5b7c336272ceb8c332f1325abf3e690382f02c4.exe	28
PID 2044 wrote to memory of 524	2044	44ccaf612dddde11842167c8d5b7c336272ceb8c332f1325abf3e690382f02c4.exe	29
PID 2044 wrote to memory of 524	2044	44ccaf612dddde11842167c8d5b7c336272ceb8c332f1325abf3e690382f02c4.exe	29
PID 2044 wrote to memory of 524	2044	44ccaf612dddde11842167c8d5b7c336272ceb8c332f1325abf3e690382f02c4.exe	29
PID 2044 wrote to memory of 524	2044	44ccaf612dddde11842167c8d5b7c336272ceb8c332f1325abf3e690382f02c4.exe	29
PID 2044 wrote to memory of 524	2044	44ccaf612dddde11842167c8d5b7c336272ceb8c332f1325abf3e690382f02c4.exe	29

C:\Users\Admin\AppData\Local\Temp\44ccaf612dddde11842167c8d5b7c336272ceb8c332f1325abf3e690382f02c4.exe
"C:\Users\Admin\AppData\Local\Temp\44ccaf612dddde11842167c8d5b7c336272ceb8c332f1325abf3e690382f02c4.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:2044
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\caspol.exe
  "C:\Users\Admin\AppData\Local\Temp\44ccaf612dddde11842167c8d5b7c336272ceb8c332f1325abf3e690382f02c4.exe"
  2⤵
  PID:436
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\caspol.exe
  "C:\Users\Admin\AppData\Local\Temp\44ccaf612dddde11842167c8d5b7c336272ceb8c332f1325abf3e690382f02c4.exe"
  2⤵
  - Checks QEMU agent file
  - Suspicious use of NtSetInformationThreadHideFromDebugger
  PID:524

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Web Service

T1102

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Web Service

T1102

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

\Users\Admin\AppData\Local\Temp\nsoD1D.tmp\System.dll

Filesize
11KB

MD5
8b3830b9dbf87f84ddd3b26645fed3a0

SHA1
223bef1f19e644a610a0877d01eadc9e28299509

SHA256
f004c568d305cd95edbd704166fcd2849d395b595dff814bcc2012693527ac37

SHA512
d13cfd98db5ca8dc9c15723eee0e7454975078a776bce26247228be4603a0217e166058ebadc68090afe988862b7514cb8cb84de13b3de35737412a6f0a8ac03

Download Submit
memory/524-64-0x0000000001390000-0x000000000244B000-memory.dmp

Filesize
16.7MB

Download
memory/524-66-0x0000000000400000-0x0000000000615000-memory.dmp

Filesize
2.1MB

Download
memory/524-85-0x0000000001390000-0x000000000244B000-memory.dmp

Filesize
16.7MB

Download
memory/2044-63-0x0000000002D30000-0x0000000003DEB000-memory.dmp

Filesize
16.7MB

Download
memory/2044-65-0x0000000002D30000-0x0000000003DEB000-memory.dmp

Filesize
16.7MB

Download