guloader | 42f9b1bba13a197bd310cffc87c3fd369a86304e33d0a121e12ea1a6f8d8390b

General

Target

42f9b1bba13a197bd310cffc87c3fd369a86304e33d0a121e12ea1a6f8d8390b.exe
Size

733KB
MD5

2516ea98df835dfeae9839d0eca3c0cd
SHA1

32c712bf66ad886851dca095599799c46432bf52
SHA256

42f9b1bba13a197bd310cffc87c3fd369a86304e33d0a121e12ea1a6f8d8390b
SHA512

9fda155ef253487b05019acd842e5030718a311787ab3d78cf7b9568c77bb06375c7ef2b9144104e2030c19c9a0b31f3540831be5e76f693259a88bf0476397e
SSDEEP

12288:WIE5EDEgtTeBTgQFZHmsRe3GwGw/HOHnO6LjewtuABBQqGJCUu8Mt:WIE5Eg6iTgEZZwGwgxjLMkun1Mt

Score

10^/10

guloader discovery downloader

Malware Config

Signatures

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

Loads dropped DLL 6 IoCs

pid	Process
1856	42f9b1bba13a197bd310cffc87c3fd369a86304e33d0a121e12ea1a6f8d8390b.exe
1856	42f9b1bba13a197bd310cffc87c3fd369a86304e33d0a121e12ea1a6f8d8390b.exe
1856	42f9b1bba13a197bd310cffc87c3fd369a86304e33d0a121e12ea1a6f8d8390b.exe
1856	42f9b1bba13a197bd310cffc87c3fd369a86304e33d0a121e12ea1a6f8d8390b.exe
1856	42f9b1bba13a197bd310cffc87c3fd369a86304e33d0a121e12ea1a6f8d8390b.exe
1856	42f9b1bba13a197bd310cffc87c3fd369a86304e33d0a121e12ea1a6f8d8390b.exe

Suspicious use of NtCreateThreadExHideFromDebugger 1 IoCs

pid	Process
2892	42f9b1bba13a197bd310cffc87c3fd369a86304e33d0a121e12ea1a6f8d8390b.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

pid	Process
1856	42f9b1bba13a197bd310cffc87c3fd369a86304e33d0a121e12ea1a6f8d8390b.exe
2892	42f9b1bba13a197bd310cffc87c3fd369a86304e33d0a121e12ea1a6f8d8390b.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 1856 set thread context of 2892	1856	42f9b1bba13a197bd310cffc87c3fd369a86304e33d0a121e12ea1a6f8d8390b.exe	84

Drops file in Program Files directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Program Files (x86)\Common Files\Krlighedserklringers60\dehydreringerne.ini	42f9b1bba13a197bd310cffc87c3fd369a86304e33d0a121e12ea1a6f8d8390b.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
2500	2892	WerFault.exe	84

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	42f9b1bba13a197bd310cffc87c3fd369a86304e33d0a121e12ea1a6f8d8390b.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	42f9b1bba13a197bd310cffc87c3fd369a86304e33d0a121e12ea1a6f8d8390b.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
2892	42f9b1bba13a197bd310cffc87c3fd369a86304e33d0a121e12ea1a6f8d8390b.exe
2892	42f9b1bba13a197bd310cffc87c3fd369a86304e33d0a121e12ea1a6f8d8390b.exe

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
1856	42f9b1bba13a197bd310cffc87c3fd369a86304e33d0a121e12ea1a6f8d8390b.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 1856 wrote to memory of 2892	1856	42f9b1bba13a197bd310cffc87c3fd369a86304e33d0a121e12ea1a6f8d8390b.exe	84
PID 1856 wrote to memory of 2892	1856	42f9b1bba13a197bd310cffc87c3fd369a86304e33d0a121e12ea1a6f8d8390b.exe	84
PID 1856 wrote to memory of 2892	1856	42f9b1bba13a197bd310cffc87c3fd369a86304e33d0a121e12ea1a6f8d8390b.exe	84
PID 1856 wrote to memory of 2892	1856	42f9b1bba13a197bd310cffc87c3fd369a86304e33d0a121e12ea1a6f8d8390b.exe	84
PID 1856 wrote to memory of 2892	1856	42f9b1bba13a197bd310cffc87c3fd369a86304e33d0a121e12ea1a6f8d8390b.exe	84

C:\Users\Admin\AppData\Local\Temp\42f9b1bba13a197bd310cffc87c3fd369a86304e33d0a121e12ea1a6f8d8390b.exe
"C:\Users\Admin\AppData\Local\Temp\42f9b1bba13a197bd310cffc87c3fd369a86304e33d0a121e12ea1a6f8d8390b.exe"
1⤵
- Loads dropped DLL
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious use of SetThreadContext
- Drops file in Program Files directory
- System Location Discovery: System Language Discovery
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:1856
- C:\Users\Admin\AppData\Local\Temp\42f9b1bba13a197bd310cffc87c3fd369a86304e33d0a121e12ea1a6f8d8390b.exe
  "C:\Users\Admin\AppData\Local\Temp\42f9b1bba13a197bd310cffc87c3fd369a86304e33d0a121e12ea1a6f8d8390b.exe"
  2⤵
  - Suspicious use of NtCreateThreadExHideFromDebugger
  - Suspicious use of NtSetInformationThreadHideFromDebugger
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  PID:2892
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 2892 -s 228
    3⤵
    - Program crash
    PID:2500

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 404 -p 2892 -ip 2892
1⤵
PID:5028

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

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\nsjB5D5.tmp\LangDLL.dll

Filesize
5KB

MD5
50016010fb0d8db2bc4cd258ceb43be5

SHA1
44ba95ee12e69da72478cf358c93533a9c7a01dc

SHA256
32230128c18574c1e860dfe4b17fe0334f685740e27bc182e0d525a8948c9c2e

SHA512
ed4cf49f756fbf673449dca20e63dce6d3a612b61f294efc9c3ccebeffa6a1372667932468816d3a7afdb7e5a652760689d8c6d3f331cedee7247404c879a233

Download Submit
C:\Users\Admin\AppData\Local\Temp\nsjB5D5.tmp\System.dll

Filesize
12KB

MD5
4add245d4ba34b04f213409bfe504c07

SHA1
ef756d6581d70e87d58cc4982e3f4d18e0ea5b09

SHA256
9111099efe9d5c9b391dc132b2faf0a3851a760d4106d5368e30ac744eb42706

SHA512
1bd260cabe5ea3cefbbc675162f30092ab157893510f45a1b571489e03ebb2903c55f64f89812754d3fe03c8f10012b8078d1261a7e73ac1f87c82f714bce03d

Download Submit
memory/1856-28-0x0000000004F70000-0x0000000005E15000-memory.dmp

Filesize
14.6MB

Download
memory/1856-29-0x00000000779A1000-0x0000000077AC1000-memory.dmp

Filesize
1.1MB

Download
memory/1856-31-0x0000000004F70000-0x0000000005E15000-memory.dmp

Filesize
14.6MB

Download
memory/1856-30-0x00000000745F5000-0x00000000745F6000-memory.dmp

Filesize
4KB

Download
memory/1856-32-0x0000000004F70000-0x0000000005E15000-memory.dmp

Filesize
14.6MB

Download
memory/2892-36-0x0000000077A45000-0x0000000077A46000-memory.dmp

Filesize
4KB

Download
memory/2892-40-0x0000000000400000-0x0000000001654000-memory.dmp

Filesize
18.3MB

Download
memory/2892-35-0x0000000077A28000-0x0000000077A29000-memory.dmp

Filesize
4KB

Download
memory/2892-33-0x0000000000400000-0x0000000001654000-memory.dmp

Filesize
18.3MB

Download
memory/2892-37-0x0000000000400000-0x0000000001654000-memory.dmp

Filesize
18.3MB

Download
memory/2892-38-0x0000000001660000-0x0000000002505000-memory.dmp

Filesize
14.6MB

Download
memory/2892-39-0x0000000000401000-0x0000000000404000-memory.dmp

Filesize
12KB

Download
memory/2892-34-0x0000000001660000-0x0000000002505000-memory.dmp

Filesize
14.6MB

Download
memory/2892-41-0x0000000000400000-0x0000000001654000-memory.dmp

Filesize
18.3MB

Download
memory/2892-42-0x00000000779A1000-0x0000000077AC1000-memory.dmp

Filesize
1.1MB

Download
memory/2892-43-0x0000000000401000-0x0000000000404000-memory.dmp

Filesize
12KB

Download
memory/2892-44-0x0000000000400000-0x0000000001654000-memory.dmp

Filesize
18.3MB

Download
memory/2892-45-0x0000000000400000-0x0000000001654000-memory.dmp

Filesize
18.3MB

Download
memory/2892-46-0x0000000001660000-0x0000000002505000-memory.dmp

Filesize
14.6MB

Download

Analysis

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