sheetrat | 04d92873db6dbdcde06cb4acacb5716784e149b1d293cb8fb15341b9be5c38d6

General

Target
h5ihvevlmk6olb0m.exe
Size 52KB
Sample260527-q7j4rag16w
SHA256 04d92873db6dbdcde06cb4acacb5716784e149b1d293cb8fb15341b9be5c38d6
MD5 1dc9143d2cf10a3c124785c5e3a81cc5
SHA1 e760608515043d6b397f5592f3c9c952097ad3c7
SHA512 db27863d1f500f8667b5b750da945ccc101ad7f0354ac40e5d74b145b000bdba169328ec4a6cd8b88a6776a07697efbc908579dc3db0f4b4b681a7cdfacabe3c
SSDEEP 1536:WA3k/TZF90EWGzzU5mSObnNAUb/+mUIb:WAIF90QzzUQSObnNAUb/+k
TLSH
T1063328087784AA91D6BF0AF9EF1373508377D5475942E70F1ECA80C12E6B3DA9849CE6
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

defense_evasion execution sheetrat persistence trojan

Malware Config

Extracted

Family

sheetrat

Attributes

anti_virtual
false
certificate
ayondyeh21pl4oqy
exclusion_wd
true
hidden_file
true
key
vdwjpdv92h3uyaxtvugbqlt5
path_client
%Windows%\Search.exe
path_watch_dog
2te&e5
pump
false
rootkit
false
task_client
ShellHost
task_watch_dog
ai_wfq+$t6oh$2
use_install_admin
true
user_init
true

Signatures

Family: Sheetrat, NonEuclid rat
Sheetrat aka NonEuclid RAT is a trojan written in C#.
trojan sheetrat

Detects Sheetrat Payload 2 IoCs

Sheetrat aka NonEuclid RAT is a trojan written in C#.

resource	yara_rule
behavioral1/memory/1484-0-0x0000016E7B930000-0x0000016E7B944000-memory.dmp	family_sheetrat_v1
behavioral1/files/0x000a0000000244c1-6.dat	family_sheetrat_v1

Modifies WinLogon for persistence 2 TTPs 1 IoCs

persistence

Winlogon Helper DLL

T1547.004

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Userinit = "C:\\Windows\\System32\\userinit.exe,C:\\Windows\\Search.exe"	h5ihvevlmk6olb0m.exe

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-1074038928-2032447174-945360078-1000\Control Panel\International\Geo\Nation	h5ihvevlmk6olb0m.exe

Executes dropped EXE 3 IoCs

pid	Process
592	Search.exe
1848	Search.exe
3104	Search.exe

Looks up external IP address via web service 6 IoCs

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

flow	ioc
8	api.ipify.org
25	icanhazip.com
26	icanhazip.com
62	api.ipify.org
6	api.ipify.org
7	api.ipify.org

Drops file in Windows directory 5 IoCs

description	ioc	Process
File opened for modification	C:\Windows\Search.exe	Search.exe
File opened for modification	C:\Windows\Search.exe	Search.exe
File created	C:\Windows\Search.exe	h5ihvevlmk6olb0m.exe
File opened for modification	C:\Windows\Search.exe	h5ihvevlmk6olb0m.exe
File opened for modification	C:\Windows\Search.exe	Search.exe

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

System Information Discovery
T1082

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
3988	timeout.exe

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\CLSID\{1f3427c8-5c10-4210-aa03-2ee45287d668}\Instance\	h5ihvevlmk6olb0m.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 1 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence execution

Scheduled Task

T1053.005

pid	Process
4804	schtasks.exe

Suspicious use of AdjustPrivilegeToken 5 IoCs

description	pid	Process
Token: SeDebugPrivilege	1484	h5ihvevlmk6olb0m.exe
Token: SeDebugPrivilege	592	Search.exe
Token: SeDebugPrivilege	1848	Search.exe
Token: SeIncBasePriorityPrivilege	592	Search.exe
Token: SeDebugPrivilege	3104	Search.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 1484 wrote to memory of 2468	1484	h5ihvevlmk6olb0m.exe	87
PID 1484 wrote to memory of 368	1484	h5ihvevlmk6olb0m.exe	88
PID 368 wrote to memory of 4804	368	cmd.exe	91
PID 1484 wrote to memory of 592	1484	h5ihvevlmk6olb0m.exe	93
PID 592 wrote to memory of 1628	592	Search.exe	113
PID 1628 wrote to memory of 2632	1628	CMD.exe	115
PID 592 wrote to memory of 3700	592	Search.exe	116
PID 3700 wrote to memory of 3988	3700	cmd.exe	118

Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
persistence

Query Registry
T1012

C:\Users\Admin\AppData\Local\Temp\h5ihvevlmk6olb0m.exe
"C:\Users\Admin\AppData\Local\Temp\h5ihvevlmk6olb0m.exe"
1⤵
- Modifies WinLogon for persistence
- Checks computer location settings
- Drops file in Windows directory
- Modifies registry class
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1484
- C:\Windows\SYSTEM32\CMD.exe
  "CMD" netsh advfirewall firewall add rule name="%HaWZ"kmZawbZe" dir=in action=allow program="C:\Windows\Search.exe" enable=yes & exit
  2⤵
  PID:2468
- C:\Windows\SYSTEM32\cmd.exe
  "cmd" /c schtasks /create /f /sc minute /mo 1 /tn "ShellHost" /tr "C:\Windows\Search.exe" /RL HIGHEST & exit
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:368
- - C:\Windows\system32\schtasks.exe
    schtasks /create /f /sc minute /mo 1 /tn "ShellHost" /tr "C:\Windows\Search.exe" /RL HIGHEST
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:4804
- C:\Windows\Search.exe
  "C:\Windows\Search.exe"
  2⤵
  - Executes dropped EXE
  - Drops file in Windows directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:592
- - C:\Windows\SYSTEM32\CMD.exe
    "CMD" /c schtasks /deleTe /F /Tn "ShellHost" & exit& exit
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:1628
  - - C:\Windows\system32\schtasks.exe
      schtasks /deleTe /F /Tn "ShellHost"
      4⤵
      PID:2632
- - C:\Windows\system32\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp695F.tmp.bat""
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:3700
  - - C:\Windows\system32\timeout.exe
      timeout 10 "C:\Windows"DEL "Search.exe" /f /qCD "C:\Users\Admin\AppData\Local\Temp"DEL "tmp695F.tmp.bat" /f /q
      4⤵
      Delays execution with timeout.exe
      PID:3988

C:\Windows\Search.exe
C:\Windows\Search.exe
1⤵
- Executes dropped EXE
- Drops file in Windows directory
- Suspicious use of AdjustPrivilegeToken
PID:1848

C:\Windows\Search.exe
C:\Windows\Search.exe
1⤵
- Executes dropped EXE
- Drops file in Windows directory
- Suspicious use of AdjustPrivilegeToken
PID:3104

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Persistence

Boot or Logon Autostart Execution

1

T1547

Winlogon Helper DLL

1

T1547.004

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Winlogon Helper DLL

1

T1547.004

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

2

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

Search.exe.log

Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\Search.exe.log
Size 1KB
SHA256 d049789c187b2f58c900eab10205bc037740dca8640ab40c314790fefaab66ff
MD5 f26118d675c61402c218ac6794d90a63
SHA1 ffc8d592f3ca8255ca5119eff5b576eb16ac7fac
SHA512 6f14b71dae095131053a1b590e60ccec4e14c47c745bf9d52de48988d7b93b1f50bbb6bac0222dc49e3e45def052b20be2d34e116991027718da2e0fb8eb45d0
TLSH
T17411CE723371F1D889163F072C68268417BF4724BA90EE0CB5A8626ED9364275F222F3
MD5 SHA1 SHA512 TLSH

Submit Download

tmp695F.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmp695F.tmp.bat
Size 118B
SHA256 0ebcd1e4af249ce60120c2985d8020e038e22a1384bd36becf5c1d607d6aac58
MD5 ac3e13af7924487a5f35390572b8e204
SHA1 7fa15c3a1d164d28949e32a2c179eebdaae18a3f
SHA512 0df6cb506a01a4f1cbc3eb727b3cb33c53b8c40348f88468cfd4458e10b7842be62daa3461996b513bcc4c5e62b30750d0df068930eb044eaf97a7189b82d6d2
TLSH
T1F5B01211F5924B49281F650B91BF06BC40DF8C1DFFC51B24076CC4053845C2CE9AB38C
MD5 SHA1 SHA512 TLSH

Submit Download

Search.exe

Path C:\Windows\Search.exe
Size 52KB
SHA256 04d92873db6dbdcde06cb4acacb5716784e149b1d293cb8fb15341b9be5c38d6
MD5 1dc9143d2cf10a3c124785c5e3a81cc5
SHA1 e760608515043d6b397f5592f3c9c952097ad3c7
SHA512 db27863d1f500f8667b5b750da945ccc101ad7f0354ac40e5d74b145b000bdba169328ec4a6cd8b88a6776a07697efbc908579dc3db0f4b4b681a7cdfacabe3c
SSDEEP 1536:WA3k/TZF90EWGzzU5mSObnNAUb/+mUIb:WAIF90QzzUQSObnNAUb/+k
TLSH
T1063328087784AA91D6BF0AF9EF1373508377D5475942E70F1ECA80C12E6B3DA9849CE6
MD5 SHA1 SHA512 SSDEEP TLSH

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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