guloader | b555baba6a73cce90d70d824e74c65aa6ee662ccf20e41fa35cc0821f3719299

General

Target

subadditively.exe
Size

555KB
MD5

f759efa36771423aeebc76c01a9489a5
SHA1

7c6d5b42de4816f2fdf5435effe2c044a2eda4d5
SHA256

e1b0efc264c4e6a272d62db808664c9dacb4984efc53810cf3c9a0e993e1ee56
SHA512

ab144828d1b176f32919bc0ee9b149870c1f8cee88c7238e5a67c74afad6ca9246ca8a20862e755b168a681fd5f68955f840374ce20c83523ad60e1a9195d86a
SSDEEP

12288:Da4KLc5c8FInuk8C4DZQpQ45tQ/USU4xp:mfjnuk8NKpDtQ/RU4

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
1932	subadditively.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
1952	subadditively.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
1932	subadditively.exe
1952	subadditively.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 1932 set thread context of 1952	1932	subadditively.exe	31

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

Suspicious behavior: EnumeratesProcesses 7 IoCs

pid	Process
1952	subadditively.exe
1952	subadditively.exe
1952	subadditively.exe
1952	subadditively.exe
1952	subadditively.exe
1952	subadditively.exe
1952	subadditively.exe

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
1932	subadditively.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 1932 wrote to memory of 1952	1932	subadditively.exe	31
PID 1932 wrote to memory of 1952	1932	subadditively.exe	31
PID 1932 wrote to memory of 1952	1932	subadditively.exe	31
PID 1932 wrote to memory of 1952	1932	subadditively.exe	31
PID 1932 wrote to memory of 1952	1932	subadditively.exe	31
PID 1932 wrote to memory of 1952	1932	subadditively.exe	31

C:\Users\Admin\AppData\Local\Temp\subadditively.exe
"C:\Users\Admin\AppData\Local\Temp\subadditively.exe"
1⤵
- Loads dropped DLL
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:1932
- C:\Users\Admin\AppData\Local\Temp\subadditively.exe
  "C:\Users\Admin\AppData\Local\Temp\subadditively.exe"
  2⤵
  - Suspicious use of NtCreateThreadExHideFromDebugger
  - Suspicious use of NtSetInformationThreadHideFromDebugger
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  PID:1952

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\Roaming\Microsoft\Windows\Templates\Gaulin.ini

Filesize
37B

MD5
cfda8e6aade7958f94a959bdb29cb209

SHA1
59c459e105a7af33d13a365f735e3cb7b8e5ddb0

SHA256
b4543e8ab4997934d2edc7de8a76a24b7c2ccb641212ae3b9b17fe05b71d3e87

SHA512
edfdca00667ed3a5558f7e614373f0b8393763a979154666972c659cb44e75ccd51170e4e2189043046eb4ddb8a68642bbdb6f98a0e494e76e86faaf14f993b2

Download Submit
\Users\Admin\AppData\Local\Temp\nsjBC5F.tmp\System.dll

Filesize
11KB

MD5
8b3830b9dbf87f84ddd3b26645fed3a0

SHA1
223bef1f19e644a610a0877d01eadc9e28299509

SHA256
f004c568d305cd95edbd704166fcd2849d395b595dff814bcc2012693527ac37

SHA512
d13cfd98db5ca8dc9c15723eee0e7454975078a776bce26247228be4603a0217e166058ebadc68090afe988862b7514cb8cb84de13b3de35737412a6f0a8ac03

Download Submit
memory/1932-307-0x0000000003710000-0x0000000004A56000-memory.dmp

Filesize
19.3MB

Download
memory/1932-279-0x0000000003710000-0x0000000004A56000-memory.dmp

Filesize
19.3MB

Download
memory/1932-281-0x0000000077A80000-0x0000000077C29000-memory.dmp

Filesize
1.7MB

Download
memory/1932-280-0x0000000077A81000-0x0000000077B82000-memory.dmp

Filesize
1.0MB

Download
memory/1932-282-0x0000000003710000-0x0000000004A56000-memory.dmp

Filesize
19.3MB

Download
memory/1952-283-0x0000000000400000-0x0000000001462000-memory.dmp

Filesize
16.4MB

Download
memory/1952-304-0x0000000000400000-0x0000000001462000-memory.dmp

Filesize
16.4MB

Download
memory/1952-306-0x0000000000400000-0x0000000001462000-memory.dmp

Filesize
16.4MB

Download
memory/1952-284-0x0000000077A80000-0x0000000077C29000-memory.dmp

Filesize
1.7MB

Download
memory/1952-308-0x0000000000400000-0x0000000001462000-memory.dmp

Filesize
16.4MB

Download
memory/1952-314-0x0000000000400000-0x0000000001462000-memory.dmp

Filesize
16.4MB

Download

Analysis

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