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
4808	a50bf7fe6f5b0a723a53ee261ff61f51dff6a9125b3354cdd70a95feb266eb3f.exe

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

Web Service

T1102

flow	ioc
19	drive.google.com
20	drive.google.com

Suspicious use of NtCreateThreadExHideFromDebugger 1 IoCs

pid	Process
3464	a50bf7fe6f5b0a723a53ee261ff61f51dff6a9125b3354cdd70a95feb266eb3f.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
4808	a50bf7fe6f5b0a723a53ee261ff61f51dff6a9125b3354cdd70a95feb266eb3f.exe
3464	a50bf7fe6f5b0a723a53ee261ff61f51dff6a9125b3354cdd70a95feb266eb3f.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 4808 set thread context of 3464	4808	a50bf7fe6f5b0a723a53ee261ff61f51dff6a9125b3354cdd70a95feb266eb3f.exe	87

Drops file in Windows directory 5 IoCs

description	ioc	Process
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
File opened for modification	C:\Windows\storsejlenes\blackweed.hor	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
2444	3464	WerFault.exe	87

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 2 IoCs

pid	Process
3464	a50bf7fe6f5b0a723a53ee261ff61f51dff6a9125b3354cdd70a95feb266eb3f.exe
3464	a50bf7fe6f5b0a723a53ee261ff61f51dff6a9125b3354cdd70a95feb266eb3f.exe

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
4808	a50bf7fe6f5b0a723a53ee261ff61f51dff6a9125b3354cdd70a95feb266eb3f.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 4808 wrote to memory of 3464	4808	a50bf7fe6f5b0a723a53ee261ff61f51dff6a9125b3354cdd70a95feb266eb3f.exe	87
PID 4808 wrote to memory of 3464	4808	a50bf7fe6f5b0a723a53ee261ff61f51dff6a9125b3354cdd70a95feb266eb3f.exe	87
PID 4808 wrote to memory of 3464	4808	a50bf7fe6f5b0a723a53ee261ff61f51dff6a9125b3354cdd70a95feb266eb3f.exe	87
PID 4808 wrote to memory of 3464	4808	a50bf7fe6f5b0a723a53ee261ff61f51dff6a9125b3354cdd70a95feb266eb3f.exe	87
PID 4808 wrote to memory of 3464	4808	a50bf7fe6f5b0a723a53ee261ff61f51dff6a9125b3354cdd70a95feb266eb3f.exe	87

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:4808
- 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
  PID:3464
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 3464 -s 1076
    3⤵
    - Program crash
    PID:2444

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 412 -p 3464 -ip 3464
1⤵
PID:4900

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

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Downloads

C:\Users\Admin\AppData\Local\Temp\nsmBE11.tmp\System.dll

Filesize
11KB

MD5
34442e1e0c2870341df55e1b7b3cccdc

SHA1
99b2fa21aead4b6ccd8ff2f6d3d3453a51d9c70c

SHA256
269d232712c86983336badb40b9e55e80052d8389ed095ebf9214964d43b6bb1

SHA512
4a8c57fb12997438b488b862f3fc9dc0f236e07bb47b2bce6053dcb03ac7ad171842f02ac749f02dda4719c681d186330524cd2953d33cb50854844e74b33d51

Download Submit
C:\Windows\Arder.lnk

Filesize
722B

MD5
0f4bd53a63a7a4ed46df0f42a3d248ce

SHA1
875e1d20a386d7810e6befc7793054c357555fa8

SHA256
13752b5c6f1248c7fe42f8c1d11e8a8402034bbbd30168cfc5223446de5c7d59

SHA512
c18be80707390cf8c36912494a49eb209a7fdb2e8b6e8f35087e7fd17fe919fc436997a3fc83c1a51b10631cee158e273b919a63a1ccbd4ea92ddadaabf13633

Download Submit
memory/3464-301-0x0000000001660000-0x0000000002DB2000-memory.dmp

Filesize
23.3MB

Download
memory/3464-304-0x0000000077961000-0x0000000077A81000-memory.dmp

Filesize
1.1MB

Download
memory/3464-307-0x0000000001660000-0x0000000002DB2000-memory.dmp

Filesize
23.3MB

Download
memory/3464-306-0x0000000000400000-0x0000000001654000-memory.dmp

Filesize
18.3MB

Download
memory/3464-305-0x0000000000400000-0x0000000001654000-memory.dmp

Filesize
18.3MB

Download
memory/3464-303-0x0000000000400000-0x0000000001654000-memory.dmp

Filesize
18.3MB

Download
memory/3464-285-0x0000000000400000-0x0000000001654000-memory.dmp

Filesize
18.3MB

Download
memory/3464-286-0x0000000001660000-0x0000000002DB2000-memory.dmp

Filesize
23.3MB

Download
memory/3464-287-0x00000000779E8000-0x00000000779E9000-memory.dmp

Filesize
4KB

Download
memory/3464-288-0x0000000077A05000-0x0000000077A06000-memory.dmp

Filesize
4KB

Download
memory/3464-302-0x0000000000400000-0x0000000001654000-memory.dmp

Filesize
18.3MB

Download
memory/4808-279-0x00000000029B0000-0x0000000004102000-memory.dmp

Filesize
23.3MB

Download
memory/4808-284-0x00000000029B0000-0x0000000004102000-memory.dmp

Filesize
23.3MB

Download
memory/4808-283-0x0000000074E00000-0x0000000074E06000-memory.dmp

Filesize
24KB

Download
memory/4808-280-0x00000000029B0000-0x0000000004102000-memory.dmp

Filesize
23.3MB

Download
memory/4808-281-0x0000000077961000-0x0000000077A81000-memory.dmp

Filesize
1.1MB

Download
memory/4808-282-0x0000000074E04000-0x0000000074E05000-memory.dmp

Filesize
4KB

Download

Analysis

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