guloader | a50bf7fe6f5b0a723a53ee261ff61f51dff6a9125b3354cdd70a95feb266eb3f

General

Target

a50bf7fe6f5b0a723a53ee261ff61f51dff6a9125b3354cdd70a95feb266eb3f.exe
Size

862KB
MD5

8bafb03143a49a5610e63f7565d2b27a
SHA1

fc3660cb237fbaa698533766ed9f2f8c53492eb3
SHA256

a50bf7fe6f5b0a723a53ee261ff61f51dff6a9125b3354cdd70a95feb266eb3f
SHA512

e569b18d9ba75f59d8f8b226c8bf39a3559dec018fed1c781341ae763f08e7053eba4ab098855979606fc25df5270d9aadda6fc98a8ec747b051746ee0fad9c7
SSDEEP

24576:LiGFaq43NvC0X2ORCujTrlV4oNLbXSwRJ/QOeaj:LiGFu3NvvXztdhNLueJ/qaj

Score

10^/10

guloader discovery downloader

Malware Config

Signatures

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

Loads dropped DLL 1 IoCs

pid	Process
2076	a50bf7fe6f5b0a723a53ee261ff61f51dff6a9125b3354cdd70a95feb266eb3f.exe

Legitimate hosting services abused for malware hosting/C2 1 TTPs 2 IoCs

Web Service

T1102

flow	ioc
4	drive.google.com
5	drive.google.com

Suspicious use of NtCreateThreadExHideFromDebugger 1 IoCs

pid	Process
2296	a50bf7fe6f5b0a723a53ee261ff61f51dff6a9125b3354cdd70a95feb266eb3f.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
2076	a50bf7fe6f5b0a723a53ee261ff61f51dff6a9125b3354cdd70a95feb266eb3f.exe
2296	a50bf7fe6f5b0a723a53ee261ff61f51dff6a9125b3354cdd70a95feb266eb3f.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 2076 set thread context of 2296	2076	a50bf7fe6f5b0a723a53ee261ff61f51dff6a9125b3354cdd70a95feb266eb3f.exe	32

Drops file in Windows directory 5 IoCs

description	ioc	Process
File opened for modification	C:\Windows\storsejlenes\blackweed.hor	a50bf7fe6f5b0a723a53ee261ff61f51dff6a9125b3354cdd70a95feb266eb3f.exe
File opened for modification	C:\Windows\Arder.lnk	a50bf7fe6f5b0a723a53ee261ff61f51dff6a9125b3354cdd70a95feb266eb3f.exe
File created	C:\Windows\Arder.lnk	a50bf7fe6f5b0a723a53ee261ff61f51dff6a9125b3354cdd70a95feb266eb3f.exe
File opened for modification	C:\Windows\resources\0409\figenkaktusses\Ea40.ini	a50bf7fe6f5b0a723a53ee261ff61f51dff6a9125b3354cdd70a95feb266eb3f.exe
File opened for modification	C:\Windows\Fonts\heraclitic.Wom	a50bf7fe6f5b0a723a53ee261ff61f51dff6a9125b3354cdd70a95feb266eb3f.exe

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

System Information Discovery
T1082

Program crash 1 IoCs

pid	pid_target	Process	procid_target
2228	2296	WerFault.exe	32

System Location Discovery: System Language Discovery 1 TTPs 2 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	a50bf7fe6f5b0a723a53ee261ff61f51dff6a9125b3354cdd70a95feb266eb3f.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	a50bf7fe6f5b0a723a53ee261ff61f51dff6a9125b3354cdd70a95feb266eb3f.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
2296	a50bf7fe6f5b0a723a53ee261ff61f51dff6a9125b3354cdd70a95feb266eb3f.exe

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
2076	a50bf7fe6f5b0a723a53ee261ff61f51dff6a9125b3354cdd70a95feb266eb3f.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 2076 wrote to memory of 2296	2076	a50bf7fe6f5b0a723a53ee261ff61f51dff6a9125b3354cdd70a95feb266eb3f.exe	32
PID 2076 wrote to memory of 2296	2076	a50bf7fe6f5b0a723a53ee261ff61f51dff6a9125b3354cdd70a95feb266eb3f.exe	32
PID 2076 wrote to memory of 2296	2076	a50bf7fe6f5b0a723a53ee261ff61f51dff6a9125b3354cdd70a95feb266eb3f.exe	32
PID 2076 wrote to memory of 2296	2076	a50bf7fe6f5b0a723a53ee261ff61f51dff6a9125b3354cdd70a95feb266eb3f.exe	32
PID 2076 wrote to memory of 2296	2076	a50bf7fe6f5b0a723a53ee261ff61f51dff6a9125b3354cdd70a95feb266eb3f.exe	32
PID 2076 wrote to memory of 2296	2076	a50bf7fe6f5b0a723a53ee261ff61f51dff6a9125b3354cdd70a95feb266eb3f.exe	32
PID 2296 wrote to memory of 2228	2296	a50bf7fe6f5b0a723a53ee261ff61f51dff6a9125b3354cdd70a95feb266eb3f.exe	34
PID 2296 wrote to memory of 2228	2296	a50bf7fe6f5b0a723a53ee261ff61f51dff6a9125b3354cdd70a95feb266eb3f.exe	34
PID 2296 wrote to memory of 2228	2296	a50bf7fe6f5b0a723a53ee261ff61f51dff6a9125b3354cdd70a95feb266eb3f.exe	34
PID 2296 wrote to memory of 2228	2296	a50bf7fe6f5b0a723a53ee261ff61f51dff6a9125b3354cdd70a95feb266eb3f.exe	34

C:\Users\Admin\AppData\Local\Temp\a50bf7fe6f5b0a723a53ee261ff61f51dff6a9125b3354cdd70a95feb266eb3f.exe
"C:\Users\Admin\AppData\Local\Temp\a50bf7fe6f5b0a723a53ee261ff61f51dff6a9125b3354cdd70a95feb266eb3f.exe"
1⤵
- Loads dropped DLL
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious use of SetThreadContext
- Drops file in Windows directory
- System Location Discovery: System Language Discovery
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:2076
- C:\Users\Admin\AppData\Local\Temp\a50bf7fe6f5b0a723a53ee261ff61f51dff6a9125b3354cdd70a95feb266eb3f.exe
  "C:\Users\Admin\AppData\Local\Temp\a50bf7fe6f5b0a723a53ee261ff61f51dff6a9125b3354cdd70a95feb266eb3f.exe"
  2⤵
  - Suspicious use of NtCreateThreadExHideFromDebugger
  - Suspicious use of NtSetInformationThreadHideFromDebugger
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of WriteProcessMemory
  PID:2296
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 2296 -s 68
    3⤵
    - Program crash
    PID:2228

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Information Discovery

1

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Web Service

1

T1102

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

C:\Windows\Arder.lnk

Filesize
710B

MD5
20fdc96ca07445a7336712a03456bd91

SHA1
b1f2eedc8b3359ff139830850ca2c9cecd8cfa0a

SHA256
d320e729436bea99fda768e3addc2caae71cbfb90638b494b804ddd6ef0d7837

SHA512
b4f0f572c49670cdcdbd0b92b09b7ee7eda88b13865663b754d309be96eba7cb1f13bdff0a48e45cd1a628635f115e8fbed3596d870bb2d1d27e7588269a65dd

Download Submit
\Users\Admin\AppData\Local\Temp\nso8779.tmp\System.dll

Filesize
11KB

MD5
34442e1e0c2870341df55e1b7b3cccdc

SHA1
99b2fa21aead4b6ccd8ff2f6d3d3453a51d9c70c

SHA256
269d232712c86983336badb40b9e55e80052d8389ed095ebf9214964d43b6bb1

SHA512
4a8c57fb12997438b488b862f3fc9dc0f236e07bb47b2bce6053dcb03ac7ad171842f02ac749f02dda4719c681d186330524cd2953d33cb50854844e74b33d51

Download Submit
memory/2076-280-0x0000000002EF0000-0x0000000004642000-memory.dmp

Filesize
23.3MB

Download
memory/2076-281-0x00000000774C1000-0x00000000775C2000-memory.dmp

Filesize
1.0MB

Download
memory/2076-282-0x00000000774C0000-0x0000000077669000-memory.dmp

Filesize
1.7MB

Download
memory/2076-283-0x00000000776B0000-0x0000000077786000-memory.dmp

Filesize
856KB

Download
memory/2076-284-0x0000000002EF0000-0x0000000004642000-memory.dmp

Filesize
23.3MB

Download
memory/2296-285-0x0000000000400000-0x0000000001462000-memory.dmp

Filesize
16.4MB

Download
memory/2296-286-0x00000000774C0000-0x0000000077669000-memory.dmp

Filesize
1.7MB

Download
memory/2296-306-0x0000000000400000-0x0000000001462000-memory.dmp

Filesize
16.4MB

Download
memory/2296-308-0x0000000000400000-0x0000000001462000-memory.dmp

Filesize
16.4MB

Download
memory/2296-307-0x0000000000400000-0x0000000001462000-memory.dmp

Filesize
16.4MB

Download
memory/2296-309-0x0000000000400000-0x0000000001462000-memory.dmp

Filesize
16.4MB

Download
memory/2296-310-0x0000000000400000-0x0000000001462000-memory.dmp

Filesize
16.4MB

Download
memory/2296-311-0x0000000000400000-0x0000000001462000-memory.dmp

Filesize
16.4MB

Download

Analysis

Sharing