guloader | 2a831c8d63686e4b79cfced16e26d47f95de8cdbd178876659f9e7ec75e42789

General

Target

a15da9fdfd935a4b05adc5e0cf0053a0.exe
Size

352KB
MD5

a15da9fdfd935a4b05adc5e0cf0053a0
SHA1

71be4a53794322a70c36f22a532bdd5a9e82c47a
SHA256

2a831c8d63686e4b79cfced16e26d47f95de8cdbd178876659f9e7ec75e42789
SHA512

7035c68e51f340633b4b1a1d2e0c3d9f91ccf8398936a9604ec1119b0880d53360e213f04e0243ef9ac69cd2a23614e243533dd3494ff84854e1763606fa3d8e
SSDEEP

6144:Hwq3NpAucY3Mh7fR6dtdKE0CuLavZDC8xr3gKkYbrx+gb6e+D:HzMp3cfKE7ZDCC1rrx+Ve+D

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	a15da9fdfd935a4b05adc5e0cf0053a0.exe
File opened (read-only)	C:\Program Files\Qemu-ga\qemu-ga.exe	a15da9fdfd935a4b05adc5e0cf0053a0.exe

Loads dropped DLL 2 IoCs

pid	Process
4788	a15da9fdfd935a4b05adc5e0cf0053a0.exe
4788	a15da9fdfd935a4b05adc5e0cf0053a0.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-1-5-21-1722984668-1829624581-3022101259-1000\Software\Microsoft\Windows\CurrentVersion\RunOnce	a15da9fdfd935a4b05adc5e0cf0053a0.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1722984668-1829624581-3022101259-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce\Gio = "C:\\Users\\Admin\\AppData\\Roaming\\Adverbials255\\presplenomegalic.exe"	a15da9fdfd935a4b05adc5e0cf0053a0.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
4788	a15da9fdfd935a4b05adc5e0cf0053a0.exe
4860	a15da9fdfd935a4b05adc5e0cf0053a0.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 4788 set thread context of 4860	4788	a15da9fdfd935a4b05adc5e0cf0053a0.exe	103

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
4788	a15da9fdfd935a4b05adc5e0cf0053a0.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 4788 wrote to memory of 4860	4788	a15da9fdfd935a4b05adc5e0cf0053a0.exe	103
PID 4788 wrote to memory of 4860	4788	a15da9fdfd935a4b05adc5e0cf0053a0.exe	103
PID 4788 wrote to memory of 4860	4788	a15da9fdfd935a4b05adc5e0cf0053a0.exe	103
PID 4788 wrote to memory of 4860	4788	a15da9fdfd935a4b05adc5e0cf0053a0.exe	103

C:\Users\Admin\AppData\Local\Temp\a15da9fdfd935a4b05adc5e0cf0053a0.exe
"C:\Users\Admin\AppData\Local\Temp\a15da9fdfd935a4b05adc5e0cf0053a0.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:4788
- C:\Users\Admin\AppData\Local\Temp\a15da9fdfd935a4b05adc5e0cf0053a0.exe
  "C:\Users\Admin\AppData\Local\Temp\a15da9fdfd935a4b05adc5e0cf0053a0.exe"
  2⤵
  - Checks QEMU agent file
  - Adds Run key to start application
  - Suspicious use of NtSetInformationThreadHideFromDebugger
  PID:4860

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

1

T1060

Privilege Escalation

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

2

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\nsy9CCE.tmp\System.dll

Filesize
11KB

MD5
17ed1c86bd67e78ade4712be48a7d2bd

SHA1
1cc9fe86d6d6030b4dae45ecddce5907991c01a0

SHA256
bd046e6497b304e4ea4ab102cab2b1f94ce09bde0eebba4c59942a732679e4eb

SHA512
0cbed521e7d6d1f85977b3f7d3ca7ac34e1b5495b69fd8c7bfa1a846baf53b0ecd06fe1ad02a3599082ffacaf8c71a3bb4e32dec05f8e24859d736b828092cd5

Download Submit
C:\Users\Admin\AppData\Local\Temp\nsy9CCE.tmp\System.dll

Filesize
11KB

MD5
17ed1c86bd67e78ade4712be48a7d2bd

SHA1
1cc9fe86d6d6030b4dae45ecddce5907991c01a0

SHA256
bd046e6497b304e4ea4ab102cab2b1f94ce09bde0eebba4c59942a732679e4eb

SHA512
0cbed521e7d6d1f85977b3f7d3ca7ac34e1b5495b69fd8c7bfa1a846baf53b0ecd06fe1ad02a3599082ffacaf8c71a3bb4e32dec05f8e24859d736b828092cd5

Download Submit
C:\Users\Admin\AppData\Local\Temp\nsy9CCE.tmp\System.dll

Filesize
11KB

MD5
17ed1c86bd67e78ade4712be48a7d2bd

SHA1
1cc9fe86d6d6030b4dae45ecddce5907991c01a0

SHA256
bd046e6497b304e4ea4ab102cab2b1f94ce09bde0eebba4c59942a732679e4eb

SHA512
0cbed521e7d6d1f85977b3f7d3ca7ac34e1b5495b69fd8c7bfa1a846baf53b0ecd06fe1ad02a3599082ffacaf8c71a3bb4e32dec05f8e24859d736b828092cd5

Download Submit
memory/4788-146-0x00000000078D0000-0x000000000903C000-memory.dmp

Filesize
23.4MB

Download
memory/4788-147-0x00000000078D0000-0x000000000903C000-memory.dmp

Filesize
23.4MB

Download
memory/4788-148-0x0000000077BD1000-0x0000000077CF1000-memory.dmp

Filesize
1.1MB

Download
memory/4788-149-0x0000000010000000-0x0000000010006000-memory.dmp

Filesize
24KB

Download
memory/4860-150-0x0000000000400000-0x0000000001654000-memory.dmp

Filesize
18.3MB

Download
memory/4860-151-0x0000000001660000-0x0000000002DCC000-memory.dmp

Filesize
23.4MB

Download
memory/4860-152-0x0000000077C58000-0x0000000077C59000-memory.dmp

Filesize
4KB

Download
memory/4860-153-0x0000000001660000-0x0000000002DCC000-memory.dmp

Filesize
23.4MB

Download
memory/4860-155-0x0000000077BD1000-0x0000000077CF1000-memory.dmp

Filesize
1.1MB

Download

Analysis

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