isrstealer | 4f619c7b4f54dd6ed7833880c8600334c42084a20c73d9b76973d45202a734c7

General

Target

Halkbank,doc.exe
Size

392KB
MD5

04ce3268080cb301ad8202217685ca59
SHA1

b5466d71f17fb9f454cee13a83faf7c1e2d0022d
SHA256

4f619c7b4f54dd6ed7833880c8600334c42084a20c73d9b76973d45202a734c7
SHA512

3feecf60ae8f5aa9dbba576cf61b9db8f7359ce6056ecd8c463898f4cb301242280101c5f56143b79ae07c043270612299f43246d144700d0aba0fa2970bf715
SSDEEP

12288:+/nedKoh5Y6yMYmWjBJlpeSzoD7O1CR3m:2gdh5NKtJD8PrR3m

Score

10^/10

isrstealer collection stealer trojan upx

Malware Config

Signatures

ISR Stealer
ISR Stealer is a modified version of Hackhound Stealer written in visual basic.
trojan stealer isrstealer

ISR Stealer payload 4 IoCs

resource	yara_rule
behavioral2/memory/2176-3-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/2176-6-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/2176-18-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer
behavioral2/memory/2176-19-0x0000000000400000-0x0000000000442000-memory.dmp	family_isrstealer

NirSoft MailPassView 2 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral2/memory/4416-17-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral2/memory/4416-16-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView

Nirsoft 2 IoCs

resource	yara_rule
behavioral2/memory/4416-17-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral2/memory/4416-16-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft

UPX packed file 5 IoCs

Detects executables packed with UPX/modified UPX open source packer.

upx

resource	yara_rule
behavioral2/memory/4416-11-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/4416-13-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/4416-15-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/4416-17-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral2/memory/4416-16-0x0000000000400000-0x000000000041F000-memory.dmp	upx

Accesses Microsoft Outlook accounts 1 TTPs 1 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-1141987721-3945596982-3297311814-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	regasm.exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 4884 set thread context of 2176	4884	Halkbank,doc.exe	83
PID 2176 set thread context of 2896	2176	regasm.exe	84
PID 2176 set thread context of 4416	2176	regasm.exe	96

Program crash 1 IoCs

pid	pid_target	Process	procid_target
4708	2896	WerFault.exe	84

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
4884	Halkbank,doc.exe
4884	Halkbank,doc.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4884	Halkbank,doc.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2176	regasm.exe

Suspicious use of WriteProcessMemory 24 IoCs

description	pid	Process	procid_target
PID 4884 wrote to memory of 2176	4884	Halkbank,doc.exe	83
PID 4884 wrote to memory of 2176	4884	Halkbank,doc.exe	83
PID 4884 wrote to memory of 2176	4884	Halkbank,doc.exe	83
PID 4884 wrote to memory of 2176	4884	Halkbank,doc.exe	83
PID 4884 wrote to memory of 2176	4884	Halkbank,doc.exe	83
PID 4884 wrote to memory of 2176	4884	Halkbank,doc.exe	83
PID 4884 wrote to memory of 2176	4884	Halkbank,doc.exe	83
PID 4884 wrote to memory of 2176	4884	Halkbank,doc.exe	83
PID 2176 wrote to memory of 2896	2176	regasm.exe	84
PID 2176 wrote to memory of 2896	2176	regasm.exe	84
PID 2176 wrote to memory of 2896	2176	regasm.exe	84
PID 2176 wrote to memory of 2896	2176	regasm.exe	84
PID 2176 wrote to memory of 2896	2176	regasm.exe	84
PID 2176 wrote to memory of 2896	2176	regasm.exe	84
PID 2176 wrote to memory of 2896	2176	regasm.exe	84
PID 2176 wrote to memory of 2896	2176	regasm.exe	84
PID 2176 wrote to memory of 4416	2176	regasm.exe	96
PID 2176 wrote to memory of 4416	2176	regasm.exe	96
PID 2176 wrote to memory of 4416	2176	regasm.exe	96
PID 2176 wrote to memory of 4416	2176	regasm.exe	96
PID 2176 wrote to memory of 4416	2176	regasm.exe	96
PID 2176 wrote to memory of 4416	2176	regasm.exe	96
PID 2176 wrote to memory of 4416	2176	regasm.exe	96
PID 2176 wrote to memory of 4416	2176	regasm.exe	96

C:\Users\Admin\AppData\Local\Temp\Halkbank,doc.exe
"C:\Users\Admin\AppData\Local\Temp\Halkbank,doc.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4884
- C:\Windows\Microsoft.net\Framework\v2.0.50727\regasm.exe
  "C:\Users\Admin\AppData\Local\Temp\Halkbank,doc.exe"
  2⤵
  - Suspicious use of SetThreadContext
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:2176
- - C:\Windows\Microsoft.net\Framework\v2.0.50727\regasm.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\9jrOipU1Wd.ini"
    3⤵
    PID:2896
  - - C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 2896 -s 80
      4⤵
      Program crash
      PID:4708
- - C:\Windows\Microsoft.net\Framework\v2.0.50727\regasm.exe
    /scomma "C:\Users\Admin\AppData\Local\Temp\NT1tsXSrLG.ini"
    3⤵
    - Accesses Microsoft Outlook accounts
    PID:4416

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 368 -p 2896 -ip 2896
1⤵
PID:3232

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Lateral Movement

Collection

Email Collection

1

T1114

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/2176-6-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/2176-19-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/2176-18-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/2176-3-0x0000000000400000-0x0000000000442000-memory.dmp

Filesize
264KB

Download
memory/4416-11-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/4416-13-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/4416-15-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/4416-17-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/4416-16-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/4884-7-0x0000000074630000-0x0000000074BE1000-memory.dmp

Filesize
5.7MB

Download
memory/4884-0-0x0000000074630000-0x0000000074BE1000-memory.dmp

Filesize
5.7MB

Download
memory/4884-2-0x0000000001960000-0x0000000001970000-memory.dmp

Filesize
64KB

Download
memory/4884-1-0x0000000074630000-0x0000000074BE1000-memory.dmp

Filesize
5.7MB

Download

Analysis

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