nymaim | 74a9acab7f585bdb88c73285a294c819e96d0ec15245b6e30421edcbbc72e8fd

Analysis

max time kernel
90s
max time network
140s
platform
windows10-2004_x64
resource
win10v2004-20221111-en
resource tags

arch:x64arch:x86image:win10v2004-20221111-enlocale:en-usos:windows10-2004-x64system
submitted
17/12/2022, 08:03

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General

Target
file.exe
Size 2.3MB
Sample221217-jxpg6abc21
SHA256 74a9acab7f585bdb88c73285a294c819e96d0ec15245b6e30421edcbbc72e8fd
MD5 f8dd9b370f1b695796126d35a827d88f
SHA1 3556244cfb74597339e1d716cf0b39f0960716ec
SHA512 9083e7578dd37c824d3c96c935b6b4e3655200c671f9f54c9c1f86f72d92064de6aa69d3280737d96d2e25b1234e2e18f42c6472ac6d648626c252992af70ba6
SSDEEP 49152:pf6pS96F1EA3PM9/zQfJ5SAKvN5898JOf0lVgVAs:pCpLeoPM2huT8984fy4
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

nymaim discovery trojan

Malware Config

Extracted

Family

nymaim

45.139.105.171
85.31.46.167

Signatures

NyMaim
NyMaim is a malware with various capabilities written in C++ and first seen in 2013.
trojan nymaim

Executes dropped EXE 3 IoCs

pid	Process
2652	is-K7IR5.tmp
4892	obFolders.exe
4660	FcIcQPb.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-1-5-21-2386679933-1492765628-3466841596-1000\Control Panel\International\Geo\Nation	obFolders.exe

Loads dropped DLL 1 IoCs

pid	Process
2652	is-K7IR5.tmp

Checks installed software on the system 1 TTPs
Looks up Uninstall key entries in the registry to enumerate software on the system.
discovery

Query Registry
T1012

Drops file in Program Files directory 9 IoCs

description	ioc	Process
File created	C:\Program Files (x86)\PrintFolders\is-LRCTS.tmp	is-K7IR5.tmp
File created	C:\Program Files (x86)\PrintFolders\is-HPR4A.tmp	is-K7IR5.tmp
File created	C:\Program Files (x86)\PrintFolders\is-P28K2.tmp	is-K7IR5.tmp
File created	C:\Program Files (x86)\PrintFolders\is-TMN4E.tmp	is-K7IR5.tmp
File created	C:\Program Files (x86)\PrintFolders\is-A4G8N.tmp	is-K7IR5.tmp
File created	C:\Program Files (x86)\PrintFolders\is-5UJN2.tmp	is-K7IR5.tmp
File opened for modification	C:\Program Files (x86)\PrintFolders\unins000.dat	is-K7IR5.tmp
File opened for modification	C:\Program Files (x86)\PrintFolders\obFolders.exe	is-K7IR5.tmp
File created	C:\Program Files (x86)\PrintFolders\unins000.dat	is-K7IR5.tmp

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

System Information Discovery
T1082

Kills process with taskkill 1 IoCs

evasion

pid	Process
3236	taskkill.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
4892	obFolders.exe
4892	obFolders.exe
4892	obFolders.exe
4892	obFolders.exe
4892	obFolders.exe
4892	obFolders.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	3236	taskkill.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 4512 wrote to memory of 2652	4512	file.exe	79
PID 4512 wrote to memory of 2652	4512	file.exe	79
PID 4512 wrote to memory of 2652	4512	file.exe	79
PID 2652 wrote to memory of 4892	2652	is-K7IR5.tmp	80
PID 2652 wrote to memory of 4892	2652	is-K7IR5.tmp	80
PID 2652 wrote to memory of 4892	2652	is-K7IR5.tmp	80
PID 4892 wrote to memory of 4660	4892	obFolders.exe	83
PID 4892 wrote to memory of 4660	4892	obFolders.exe	83
PID 4892 wrote to memory of 4660	4892	obFolders.exe	83
PID 4892 wrote to memory of 208	4892	obFolders.exe	89
PID 4892 wrote to memory of 208	4892	obFolders.exe	89
PID 4892 wrote to memory of 208	4892	obFolders.exe	89
PID 208 wrote to memory of 3236	208	cmd.exe	91
PID 208 wrote to memory of 3236	208	cmd.exe	91
PID 208 wrote to memory of 3236	208	cmd.exe	91

C:\Users\Admin\AppData\Local\Temp\file.exe
"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:4512
- C:\Users\Admin\AppData\Local\Temp\is-R4M7E.tmp\is-K7IR5.tmp
  "C:\Users\Admin\AppData\Local\Temp\is-R4M7E.tmp\is-K7IR5.tmp" /SL4 $80050 "C:\Users\Admin\AppData\Local\Temp\file.exe" 2115602 169472
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Drops file in Program Files directory
  - Suspicious use of WriteProcessMemory
  PID:2652
- - C:\Program Files (x86)\PrintFolders\obFolders.exe
    "C:\Program Files (x86)\PrintFolders\obFolders.exe"
    3⤵
    - Executes dropped EXE
    - Checks computer location settings
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of WriteProcessMemory
    PID:4892
  - - C:\Users\Admin\AppData\Roaming\{6cebb340-6208-11ed-bf50-806e6f6e6963}\FcIcQPb.exe
      4⤵
      Executes dropped EXE
      PID:4660
  - - C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c taskkill /im "obFolders.exe" /f & erase "C:\Program Files (x86)\PrintFolders\obFolders.exe" & exit
      4⤵
      Suspicious use of WriteProcessMemory
      PID:208
    - - C:\Windows\SysWOW64\taskkill.exe
        
        taskkill /im "obFolders.exe" /f
        5⤵
        Kills process with taskkill
        Suspicious use of AdjustPrivilegeToken
        
        PID:3236

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

obFolders.exe

Path C:\Program Files (x86)\PrintFolders\obFolders.exe
Size 3.5MB
SHA256 cb99670d8fd52fed3f116114a8a267fd83007e15afc024b57ae4ae9c4ec86f34
MD5 9661d1488e2bd1724e72f081b882496e
SHA1 b6d03432ce8ed4dcf388049aa070934db8ae633a
SHA512 e89e195f85b0891dbb57ed7fb505c23b7082acc2661015e1ed4d7560fbf90733f7843f9b98610b0423f68ac0e99b0c1335d909975a2c86580978d6bd24338fb2
SSDEEP 98304:U93ZoWSGFXJffsABGxTI77FFndRv3YmmWDzcv:eDff9dZzQ
MD5 SHA1 SHA512 SSDEEP

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obFolders.exe

Path C:\Program Files (x86)\PrintFolders\obFolders.exe
Size 3.5MB
SHA256 cb99670d8fd52fed3f116114a8a267fd83007e15afc024b57ae4ae9c4ec86f34
MD5 9661d1488e2bd1724e72f081b882496e
SHA1 b6d03432ce8ed4dcf388049aa070934db8ae633a
SHA512 e89e195f85b0891dbb57ed7fb505c23b7082acc2661015e1ed4d7560fbf90733f7843f9b98610b0423f68ac0e99b0c1335d909975a2c86580978d6bd24338fb2
SSDEEP 98304:U93ZoWSGFXJffsABGxTI77FFndRv3YmmWDzcv:eDff9dZzQ
MD5 SHA1 SHA512 SSDEEP

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_iscrypt.dll

Path C:\Users\Admin\AppData\Local\Temp\is-IMELD.tmp\_iscrypt.dll
Size 2KB
SHA256 2f6294f9aa09f59a574b5dcd33be54e16b39377984f3d5658cda44950fa0f8fc
MD5 a69559718ab506675e907fe49deb71e9
SHA1 bc8f404ffdb1960b50c12ff9413c893b56f2e36f
SHA512 e52e0aa7fe3f79e36330c455d944653d449ba05b2f9abee0914a0910c3452cfa679a40441f9ac696b3ccf9445cbb85095747e86153402fc362bb30ac08249a63
MD5 SHA1 SHA512

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is-K7IR5.tmp

Path C:\Users\Admin\AppData\Local\Temp\is-R4M7E.tmp\is-K7IR5.tmp
Size 759KB
SHA256 11ec35b1fea3160e892f0875034a2f18cf0d8d8874ac611b5a7e0f0ace2667ec
MD5 0dc8826072fc99382be7db6ae5929aff
SHA1 7ca23e146bf9bde712b27e400de3243e6bd0a357
SHA512 08db35c065b9b8f740242587f35a3c0ba772993d8132589fe26bafa9bab31d6c5aecae62490a22e135d64ce6b54c26e553534e5d9d6e01d6be8472f471bdf442
SSDEEP 12288:dh5UooqWolrP837JzHvA6izJgnnyFNmayiAZrvsZ6ZkkxOZ:D5NoqWolrP837JzHvA6yknyWFxvlZkkE
MD5 SHA1 SHA512 SSDEEP

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is-K7IR5.tmp

Path C:\Users\Admin\AppData\Local\Temp\is-R4M7E.tmp\is-K7IR5.tmp
Size 759KB
SHA256 11ec35b1fea3160e892f0875034a2f18cf0d8d8874ac611b5a7e0f0ace2667ec
MD5 0dc8826072fc99382be7db6ae5929aff
SHA1 7ca23e146bf9bde712b27e400de3243e6bd0a357
SHA512 08db35c065b9b8f740242587f35a3c0ba772993d8132589fe26bafa9bab31d6c5aecae62490a22e135d64ce6b54c26e553534e5d9d6e01d6be8472f471bdf442
SSDEEP 12288:dh5UooqWolrP837JzHvA6izJgnnyFNmayiAZrvsZ6ZkkxOZ:D5NoqWolrP837JzHvA6yknyWFxvlZkkE
MD5 SHA1 SHA512 SSDEEP

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FcIcQPb.exe

Path C:\Users\Admin\AppData\Roaming\{6cebb340-6208-11ed-bf50-806e6f6e6963}\FcIcQPb.exe
Size 72KB
SHA256 27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6
MD5 3fb36cb0b7172e5298d2992d42984d06
SHA1 439827777df4a337cbb9fa4a4640d0d3fa1738b7
SHA512 6b39cb32d77200209a25080ac92bc71b1f468e2946b651023793f3585ee6034adc70924dbd751cf4a51b5e71377854f1ab43c2dd287d4837e7b544ff886f470c
SSDEEP 1536:bvUpDLxyxA14o3/M238r6+XfHAgbqmE8MpKdwuasZLUM7DsWlXcdyZgfmi:WDLZKa/MtXfHAgbqmEtxsfmyZgfmi
MD5 SHA1 SHA512 SSDEEP

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FcIcQPb.exe

Path C:\Users\Admin\AppData\Roaming\{6cebb340-6208-11ed-bf50-806e6f6e6963}\FcIcQPb.exe
Size 72KB
SHA256 27ae813ceff8aa56e9fa68c8e50bb1c6c4a01636015eac4bd8bf444afb7020d6
MD5 3fb36cb0b7172e5298d2992d42984d06
SHA1 439827777df4a337cbb9fa4a4640d0d3fa1738b7
SHA512 6b39cb32d77200209a25080ac92bc71b1f468e2946b651023793f3585ee6034adc70924dbd751cf4a51b5e71377854f1ab43c2dd287d4837e7b544ff886f470c
SSDEEP 1536:bvUpDLxyxA14o3/M238r6+XfHAgbqmE8MpKdwuasZLUM7DsWlXcdyZgfmi:WDLZKa/MtXfHAgbqmEtxsfmyZgfmi
MD5 SHA1 SHA512 SSDEEP

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memory/4512-132-0x0000000000400000-0x0000000000430000-memory.dmp

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memory/4512-155-0x0000000000400000-0x0000000000430000-memory.dmp

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memory/4512-138-0x0000000000400000-0x0000000000430000-memory.dmp

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memory/4892-143-0x0000000000400000-0x000000000158A000-memory.dmp

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memory/4892-151-0x0000000000400000-0x000000000158A000-memory.dmp

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memory/4892-147-0x0000000010000000-0x000000001001B000-memory.dmp

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memory/4892-142-0x0000000000400000-0x000000000158A000-memory.dmp

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memory/4892-154-0x0000000000400000-0x000000000158A000-memory.dmp

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