guloader | de86179c7ad9444d2f649c0158dfb72a8203af1e716f706e3fb0955e36bedf8d

General

Target

Gruss.exe
Size

747KB
MD5

be12d58b91d733a5485688b63aaa4b32
SHA1

ddd0a6456ef8fdb505d2e8c5cbe6321742459298
SHA256

de86179c7ad9444d2f649c0158dfb72a8203af1e716f706e3fb0955e36bedf8d
SHA512

5b5e2f04e6cf3dc27ea5451ef7416304451db73cb88902358282d72bf6697491e494d7c652fde297ee948f04ebbf8538385b61286a108cc1c24f07012b9aab87
SSDEEP

12288:0F9YSXf0yM0l9r1Yk2y38SeD83S1qIFRDRxnE8UML789zUO9vVOI0emBmL:kJXlB9rqY3lRsdrxnlGUOdb0emBmL

Score

10^/10

guloader vipkeylogger discovery downloader keylogger stealer

Malware Config

Extracted

Family

vipkeylogger

Signatures

Guloader family
guloader
Guloader,Cloudeye
A shellcode based downloader first seen in 2020.
downloader guloader
VIPKeylogger
VIPKeylogger is a keylogger and infostealer written in C# and it resembles SnakeKeylogger that was found in 2020.
stealer keylogger vipkeylogger
Vipkeylogger family
vipkeylogger

Loads dropped DLL 2 IoCs

pid	Process
2996	Gruss.exe
2996	Gruss.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

Looks up external IP address via web service 3 IoCs

Uses a legitimate IP lookup service to find the infected system's external IP.

flow	ioc
14	checkip.dyndns.org
16	reallyfreegeoip.org
17	reallyfreegeoip.org

Suspicious use of NtCreateThreadExHideFromDebugger 1 IoCs

pid	Process
2120	Gruss.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
2996	Gruss.exe
2120	Gruss.exe

Drops file in Program Files directory 4 IoCs

description	ioc	Process
File opened for modification	C:\Program Files (x86)\Common Files\bedvelsens\Reaccelerates.ske	Gruss.exe
File opened for modification	C:\Program Files (x86)\Common Files\rhesusbarnet\teenfully.bra	Gruss.exe
File opened for modification	C:\Program Files (x86)\Common Files\infarkt.pla	Gruss.exe
File opened for modification	C:\Program Files (x86)\Unelaborated.non	Gruss.exe

Drops file in Windows directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\resources\rothesay\Fallenternes.con	Gruss.exe

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

System Information Discovery
T1082

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	Gruss.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Gruss.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
2120	Gruss.exe

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
2996	Gruss.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	2120	Gruss.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 2996 wrote to memory of 2120	2996	Gruss.exe	28
PID 2996 wrote to memory of 2120	2996	Gruss.exe	28
PID 2996 wrote to memory of 2120	2996	Gruss.exe	28
PID 2996 wrote to memory of 2120	2996	Gruss.exe	28
PID 2996 wrote to memory of 2120	2996	Gruss.exe	28

C:\Users\Admin\AppData\Local\Temp\Gruss.exe
"C:\Users\Admin\AppData\Local\Temp\Gruss.exe"
1⤵
- Loads dropped DLL
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Drops file in Program Files directory
- Drops file in Windows directory
- System Location Discovery: System Language Discovery
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:2996
- C:\Users\Admin\AppData\Local\Temp\Gruss.exe
  "C:\Users\Admin\AppData\Local\Temp\Gruss.exe"
  2⤵
  - Suspicious use of NtCreateThreadExHideFromDebugger
  - Suspicious use of NtSetInformationThreadHideFromDebugger
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2120

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\Public\Pictures\fedtlderstvles.lnk

Filesize
882B

MD5
0efa13f1a880fe0cc6be5b1a412c7b4d

SHA1
39814b5f4abf86a410da77bbce76d84a8c9ada8f

SHA256
a42d37a50d594711274d7f13d0ade55ec6bcf9d7b93582a009e87682b7573fb5

SHA512
24a068eeeabc71c6200eb64e9d02501cc5dd6077e25af194c1fa7824e9e331924861bc65d151ad1f49777608ebff37711c97d0e401b1518c91b8e41cafa9d0cf

Download Submit
\Users\Admin\AppData\Local\Temp\nst8CC6.tmp\System.dll

Filesize
11KB

MD5
cf85183b87314359488b850f9e97a698

SHA1
6b6c790037eec7ebea4d05590359cb4473f19aea

SHA256
3b6a5cb2a3c091814fce297c04fb677f72732fb21615102c62a195fdc2e7dfac

SHA512
fe484b3fc89aeed3a6b71b90b90ea11a787697e56be3077154b6ddc2646850f6c38589ed422ff792e391638a80a778d33f22e891e76b5d65896c6fb4696a2c3b

Download Submit
memory/2120-317-0x0000000077440000-0x00000000775E9000-memory.dmp

Filesize
1.7MB

Download
memory/2120-315-0x0000000077440000-0x00000000775E9000-memory.dmp

Filesize
1.7MB

Download
memory/2120-312-0x00000000014D0000-0x0000000002FF1000-memory.dmp

Filesize
27.1MB

Download
memory/2120-316-0x0000000000460000-0x00000000014C2000-memory.dmp

Filesize
16.4MB

Download
memory/2120-338-0x0000000000460000-0x00000000014C2000-memory.dmp

Filesize
16.4MB

Download
memory/2120-340-0x0000000000460000-0x00000000004AA000-memory.dmp

Filesize
296KB

Download
memory/2120-339-0x00000000014D0000-0x0000000002FF1000-memory.dmp

Filesize
27.1MB

Download
memory/2996-311-0x0000000077440000-0x00000000775E9000-memory.dmp

Filesize
1.7MB

Download
memory/2996-310-0x0000000077441000-0x0000000077542000-memory.dmp

Filesize
1.0MB

Download
memory/2996-314-0x0000000002D60000-0x0000000004881000-memory.dmp

Filesize
27.1MB

Download
memory/2996-313-0x0000000077630000-0x0000000077706000-memory.dmp

Filesize
856KB

Download
memory/2996-309-0x0000000002D60000-0x0000000004881000-memory.dmp

Filesize
27.1MB

Download

Analysis

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